@raorla , thank you for posting this question.
I see that you are using connect-MSGraph
which requires interactive authentication. Interactive authentication is not supported in Azure Automation. For more details of how the execution and authentication works in Azure Automation, please see Runbook execution environment
For using connect-MSGraph
in Runbooks, you would have to use one of the non-interactive methods for authentication as mentioned here - App-only access via client credential with a certificate. Use the third method (using certificate in this doc).
Hope this helps.
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