This feature has been working perfectly since September but in the last couple of days has failed every time.
My suspicions are that the response from Azure has changed somehow recently.
The error response in Advanced Installer is:
Could not read server response.
Advanced Installer 21.3.1 build 69aaef70
*** Stack Trace (x86) ***
[0x76749392] RaiseException()
[0x69ce7e86] CxxThrowException()
[0x014fae48] -----
[0x70ecc4ec] HttpQueryInfoW()
[0x00e80000] MODULE_BASE_ADDRESS