I had a similar problem and I solved it as I switched the Authentication mode to "Managed Identity: System assigned (preview)"
StreamAnalytics output to CosmosDB test fails:
陣内 和宏
11
Reputation points
Stream Analytics output Connection test to CosmosDB now fails.
Previously the same connection test was successful.
Attached is the error reproduction procedure and details of the error content.
I'm assuming something bad spec change was deployed.
Best Regards.