When creating a CIM image for MSIX app attach, make sure that you’re using a lower or equal OS version than your target OS in e.g. Azure Virtual Desktop. If you use Windows 11 to create a CIM file and try to mount this on Windows 10, the result will be one of the following.
Azure Portal:
ActivityId: 1ef4d1ad-e4af-42d1-b6fa-139c45775efb Error: The MSIX Application metadata expand request failed on all Session Hosts that it was sent to. Session Host: xxxx1, Error: Native error when mounting CIM, HResult -2147024809, ErrorCode 87.. (Code: 400)
Using the CimDiskImage PS module:
Mount-CimDiskimage : Mounting xxxxx.cim to volume failed with Error:'The operation completed successfully Errorcode:0'
Mount-CimDiskimage : Mounting xxxx.cim to volume failed with Error:'Too many posts were made to a semaphore ErrorCode:298'
When working with the api.interfaces.records.teams.microsoft.com API, I noticed that the MS portal uses an X-MS-Forest header.
At first, ignoring this went fine as doing GET calls to this api didn’t seem to require it. But, of course the moment I wanted more, it suddenly WAS required (PUT/POST).
The question was; how does the portal determine the value for this header and how do we replicate that? Well, that wasn’t difficult: apparently a call to api.interfaces.records.teams.microsoft.com/Teams.Tenant/tenants suffices and returns the value for the X-MS-Forest header for the tenant identified in your token. Example:
$headers = Get-GraphToken -tenantid $tenantId -scope "https://api.interfaces.records.teams.microsoft.com/user_impersonation"
#get the correct forest
$tenantInfo = Invoke-RestMethod -Method GET -uri "https://api.interfaces.records.teams.microsoft.com/Teams.Tenant/tenants" -UseBasicParsing -ContentType "application/json" -Headers $headers
#add the X-MS-Forest header (required) for subsequent calls
$headers["X-MS-Forest"] = $tenantInfo.serviceDiscovery.Headers.'X-MS-Forest'
However, I kept getting an invalid manifest 0x80080204 error when trying to save the manifest after adding the extension section while creating an MSIX for Visual Studio Code (which needs a specific font or icons won’t show).
I then noticed there was no xmlns link at the top of the package for uap4 🙂
