question

We are using PlayFab with Azure Functions.

On the Azure Functions side of things we are seeing a lot of System.Runtime.InteropServices.COMException exceptions being thrown, with a not-very-useful stacktrace (attached)5684-comexception.txt. As far as we know there has been no user-facing error correlating with these exceptions, but they are still a concern to us.

My search for the root cause (and solution) has been mostly fruitless, though what I have found often seems to indicate that the 3rd party client could be dropping the connection with Azure Functions mid-request:

• https://learn.microsoft.com/en-us/answers/questions/870198/azure-function-an-operation-was-attempted-on-a-non#answer-875282

• https://learn.microsoft.com/en-us/answers/questions/598791/azure-function-fails-with-functioninvocationexcept#answer-603041

• https://github.com/Azure/azure-functions-host/issues/8500#issuecomment-1164144276

Is it possible that PlayFab is dropping connections with Azure Function? If so, would there be any events tracking that on the PlayFab side? Are there any situations that you know of where PlayFab would drop connections (exceeding a timeout, too many requests, etc)?