Replace Document in Async client is throwing an authorization error.

**Describe the bug**
Calling the client.ReplaceDocument is apparently throwing a authorization error
When I call execute the following statement:
**To Reproduce**
`Observable> obs = client.replaceDocument(
collectionLink, item, ro);`

The console output throws the following error:
DocumentClientException{error={"code":"Unauthorized","message":"The input authorization token can't serve the request. Please check that the expected payload is built as per the protocol, and check the key being used. Server used the following payload to sign: 'put\ncolls\ndbs//colls/\nfri, 07 jun 2019 22:00:25 gmt\n\n'\r\nActivityId: fae077cc-8092-4f8d-939a-09c935de4462, Microsoft.Azure.Documents.Common/2.4.0.0, StatusCode: Unauthorized","additionalErrorInfo":null}, resourceAddress='null', statusCode=401, message=The input authorization token can't serve the request. Please check that the expected payload is built as per the protocol, and check the key being used. Server used the following payload to sign: 'put
colls
dbs//colls/
fri, 07 jun 2019 22:00:25 gmt

'
ActivityId: fae077cc-8092-4f8d-939a-09c935de4462, Microsoft.Azure.Documents.Common/2.4.0.0, StatusCode: Unauthorized, getCauseInfo=null, responseHeaders={content-length=407, Strict-Transport-Security=max-age=31536000, Server=Microsoft-HTTPAPI/2.0, Content-Location=https://dbname-eastus2.documents.azure.com/dbs//colls/, x-ms-gatewayversion=version=2.4.0.0, x-ms-activity-id=fae077cc-8092-4f8d-939a-09c935de4462, Date=Fri, 07 Jun 2019 22:00:24 GMT, Content-Type=application/json}, requestHeaders={authorization=type%3Dmaster%26ver%3D1.0%26sig%3DV%2Fn4viFWXX02TS6uCUVzndfwf73SgpOh2H39B7pnBno%3D, x-ms-cosmos-allow-tentative-writes=true, Accept=application/json, x-ms-date=Fri, 07 Jun 2019 22:00:25 GMT, x-ms-documentdb-partitionkey=[], x-ms-documentdb-pre-trigger-include=, x-ms-consistency-level=Session, Content-Type=application/json}}
at com.microsoft.azure.cosmosdb.rx.internal.RxGatewayStoreModel.validateOrThrow(RxGatewayStoreModel.java:445)
at com.microsoft.azure.cosmosdb.rx.internal.RxGatewayStoreModel.lambda$null$8(RxGatewayStoreModel.java:378)
at rx.internal.operators.OnSubscribeMap$MapSubscriber.onNext(OnSubscribeMap.java:69)
at rx.internal.operators.OnSubscribeMap$MapSubscriber.onNext(OnSubscribeMap.java:77)
at rx.internal.operators.DeferredScalarSubscriber.complete(DeferredScalarSubscriber.java:100)
at rx.internal.operators.DeferredScalarSubscriber.onCompleted(DeferredScalarSubscriber.java:73)
at io.reactivex.netty.protocol.http.UnicastContentSubject$AutoReleaseByteBufOperator$1.onCompleted(UnicastContentSubject.java:260)
at rx.internal.operators.BufferUntilSubscriber.onCompleted(BufferUntilSubscriber.java:156)
at io.reactivex.netty.protocol.http.UnicastContentSubject.onCompleted(UnicastContentSubject.java:282)
at io.reactivex.netty.protocol.http.client.ClientRequestResponseConverter$ResponseState.sendOnComplete(ClientRequestResponseConverter.java:413)
at io.reactivex.netty.protocol.http.client.ClientRequestResponseConverter$ResponseState.access$500(ClientRequestResponseConverter.java:350)
at io.reactivex.netty.protocol.http.client.ClientRequestResponseConverter.channelRead(ClientRequestResponseConverter.java:168)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelRead(CombinedChannelDuplexHandler.java:438)
at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:323)
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:297)
at io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:253)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
at io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1436)
at io.netty.handler.ssl.SslHandler.decodeJdkCompatible(SslHandler.java:1203)
at io.netty.handler.ssl.SslHandler.decode(SslHandler.java:1247)
at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:502)
at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:441)
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:278)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86)
at io.reactivex.netty.metrics.BytesInspector.channelRead(BytesInspector.java:59)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
at io.reactivex.netty.pipeline.InternalReadTimeoutHandler.channelRead(InternalReadTimeoutHandler.java:108)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1434)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:965)
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163)
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:656)
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:591)
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:508)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:470)
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:909)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.base/java.lang.Thread.run(Thread.java:834)

**Expected behavior**
I have not changed my keys, and I expect the basic request to authorize correctly.

**Actual behavior**
The request seems to be unauthorized even though all of the other client functions seem to be working correctly. I am able to create documents, upsert documents, create collections, read the collections, create db etc without issue.

**Environment summary**
SDK Version: 2.4.3
Java JDK version: Java 11
OS Version (e.g. Windows, Linux, MacOSX)
MacOSX Mojave 10.14.5