iOS: GetServerCallIdWithCompletionHandler throws an error most of the time

When trying to get the "Server call id", I get this error:

```
Error Domain=ACSCallingShared Code=90 "Invalid server call Id because it's empty or has invalid values."
```

I managed to get a value ONCE, out of maybe 10 attempts...

Using v 1.1.0-beta.1 of the Call sdk.

**Smartphone (please complete the following information):**
- Device: iphone 12 pro
- OS: 14.7

I tried uploading blog from app session that failed:
[acs_sdk_blog.zip](https://github.com/Azure/Communication/files/7065459/acs_sdk_blog.zip)