[BUG] AVDAppAttachPublish@1 fails without error message

Project
MSIX SDK

Describe the bug
I use the task AVDAppAttachPublish@1 in my azure devops pipeline.

With GUI I can setup the task properly, so I understand the chosen "Service connection" has the proper rights.

Unfortunately the step fails and there is no clear error given.

##[debug]Processed: ##vso[telemetry.publish area=MSIX-Packaging;feature=AVDAppAttachPublish]{"SYSTEM_TASKINSTANCEID":"xx","SYSTEM_JOBID":"xx","SYSTEM_PLANID":"xx","SYSTEM_COLLECTIONID":"xxx","AGENT_ID":"8","AGENT_MACHINENAME":"fv-az432-888","AGENT_NAME":"Hosted Agent","AGENT_JOBSTATUS":"Succeeded","AGENT_OS":"Windows_NT","AGENT_VERSION":"4.248.0","BUILD_BUILDID":"1391","BUILD_BUILDNUMBER":"20250108.12","BUILD_BUILDURI":"vstfs:///Build/Build/1391","BUILD_CONTAINERID":"81413060","BUILD_DEFINITIONNAME":"xxx","BUILD_DEFINITIONVERSION":"2","BUILD_REASON":"Manual","BUILD_REPOSITORY_CLEAN":"False","BUILD_REPOSITORY_GIT_SUBMODULECHECKOUT":"False","BUILD_REPOSITORY_NAME":"xxx","BUILD_REPOSITORY_PROVIDER":"TfsGit","BUILD_SOURCEVERSION":"7b3f9e6452468","Version":"2.0.0","AppAttachImagePath":"D:\\a\\1\\a\\AppAttach\\app.vhdx","IsSuccessful":false,"ExceptionMessage":{}}
##[debug]task result: Failed
##[error]TypeError: exceptionMessage.match is not a function
##[debug]Processed: ##vso[task.issue type=error;]TypeError: exceptionMessage.match is not a function
##[debug]Processed: ##vso[task.complete result=Failed;]TypeError: exceptionMessage.match is not a function

So the task fails but the ExceptionMessage property is empty. So the resulted error displays that it is not able to show the exception message from the task itself

Start by reproducing AVDAppAttachPublish@1 in an Azure DevOps pipeline using the reported setup and inspect how the task handles the empty ExceptionMessage value. Confirm that a failed task reports its underlying error, rather than failing again with TypeError: exceptionMessage.match is not a function.