@flyredeagle
Thank you for the detailed post and for your updates!
When it comes to Microsoft reaching out to you via phone call, if you've never opened a support request or had any reason for us to reach out, then from my experience, this wouldn't be normal procedure. However, from your issue description, I believe this should definitely be looked at by our support team so they can take a closer look into your environment and issue.
If you have any other questions, please let me know.
Thank you for your time and patience throughout this issue.
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