Added the update hang issues from Alex Bass

Author: alkohli

azure-local/known-issues.md

@@ -46,13 +46,11 @@ The following issues are fixed in this release:
 
 ## Known issues in this release
 
-Microsoft is not aware of any known issues in this release.
-
-<!--The following table lists the known issues in this release:
+The following table lists the known issues in this release:
 
 |Feature  |Issue  |Workaround  |
 |---------|---------|---------|
-| XX  | ||-->
+| Update  | When monitoring update progress in the Azure Update Management portal, the progress might appear to not have updated for several hours. | Run `Get-SolutionUpdate` on one of the cluster nodes. If an update object is returned, the update might be taking longer than expected but it is progressing. If an update object is not returned, the update may be stalled. For detailed steps on how to resolve this issue, see the [Troubleshooting guide](https://github.com/Azure/AzureLocal-Supportability/blob/main/TSG/Update/Get-SolutionUpdate-GatewayTimeout.md).|
 
 ## Known issues from previous releases