I checked and the dashboard does seem to be malfunctioning. Here’s a temporary workaround while we work on patching it.
In the global resource group there is a storage account named <abcxyz>admin. Go to Containers in the left side panel and in the zips folder is a file called unreal_1.zip, which is your app. The app gets downloaded and unzipped with each new VM, so you can directly replace this with your updated version. You’ll need the name to exactly match unreal_1.zip and you upload with the “Overwrite” option. (You might be able to use the “Uploads” folder and increment versions there, but this seems more direct)
Any new instances will grab it, but for running instances you’ll need to manually delete them from the “Instances” tab in the VMSS for each region so a new one is created. Alternatively you can use the “Scaling” tab to manually set the instance count to 0. Hopefully this works for you.
One other layer of protection would be to make a clean or personalized distribution URL that redirects to the traffic manager, so that a new deployment could be used without changing the user-facing URL. It’s obviously too late for that to solve the current situation and shouldn’t be necessary for this current issue we’re facing.