Hi,

Just a passer-by comment. Not sure if the same question is asked here, linking the two for ease.

I could not get more information on the exact cause, but here are a few more pointers to check 

- Are you trying from an unsupported region for External models?
https://learn.microsoft.com/en-us/azure/databricks/machine-learning/model-serving/model-serving-limi...

- Also, from the internal discussion as mentioned earlier it looks like there is some work going on on this.

I have requested more info, and as I have details I can post further.