I get error messages complaining my account has no authorization to access sagemaker:
AccessDeniedException
User: arn:aws:sts::155283213483:assumed-role/voclabs/user2696198=Roger_Krimstock is not authorized to perform: sagemaker:ListDomains on resource: arn:aws:sagemaker:us-west-1:155283213483:domain/* with an explicit deny in a service control policy
I see a response from graham_broughton suggesting trying again later. Of course, that puts me in the position having to wait up to 20 minutes to start, when resources are finally accessible, sigh.
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To close this (at least for me), exiting and re-logging worked. There was an error message that I ignored. I was then able to work the lab.