[IntelliJ][ReportedByUser] Uncaught Exception Operator called default onErrorDropped com.microsoft.azure.toolkit.lib.common.operation.OperationException: deploy artifact to web app (ulc-epex)

IntelliJ build version: 2021.3 IC-213.5744.223
OS: Windows 10
JDK: JetBrains s.r.o. 11.0.13
Plugin version: 3.81.1-2021.3
Additional Info: None
Parent component:

com.intellij.openapi.wm.impl.IdeRootPane[,8,8,1921x1040,layout=com.intellij.openapi.wm.impl.IdeRootPane$MyRootLayout,alignmentX=0.0,alignmentY=0.0,border=,flags=449,maximumSize=,minimumSize=,preferredSize=]

Error message:

IdeaLoggingEvent[message=Operator called default onErrorDropped, throwable=com.microsoft.azure.toolkit.lib.common.operation.OperationException: deploy artifact to web app (ulc-epex)
	at com.microsoft.azure.toolkit.lib.common.operation.AzureOperationAspect.afterThrowing(AzureOperationAspect.java:93)
	at com.microsoft.azure.toolkit.lib.common.operation.AzureOperationAspect.afterThrowing(AzureOperationAspect.java:43)
	at com.microsoft.azure.toolkit.intellij.legacy.webapp.runner.webappconfig.WebAppRunState.executeSteps(WebAppRunState.java:99)
	at com.microsoft.azure.toolkit.intellij.legacy.webapp.runner.webappconfig.WebAppRunState.executeSteps(WebAppRunState.java:58)
	at com.microsoft.azure.toolkit.intellij.legacy.common.AzureRunProfileState.lambda$execute$0(AzureRunProfileState.java:60)
Caused by: reactor.core.Exceptions$ReactiveException: java.lang.

Start with the stack trace entries in AzureOperationAspect.java, WebAppRunState.java, and AzureRunProfileState.java, then reproduce the web app deployment from the IntelliJ plugin on the reported environment. Trace the underlying ReactiveException beyond the truncated report and verify that the deployment failure is surfaced without an uncaught onErrorDropped exception.