OfficeDev/microsoft-teams-app-schema

MPNID cannot be empty.

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I'm writing a tiny Personal-Tab app for a client, we were expecting it to be ready for later today so I built it a few weeks ago using a dev tenant; however I cannot publish or remake it in the client's tenant now because App Studio for some reason is giving an error that "MPNID cannot be empty". And, it's returning this error regardless of whether the MPN ID field in the "App details" page actually has a value or not.
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I've left it blank, set it to my company's real MPNID, set it to a random 7-digit number, set it to a random 2-digit number, set it to a random 10-digit number (as per the schema's stated max length), set it to an alpha string (why is this even allowed), etc... and none of these work.
I tried to raise this as a bug with App Studio but I couldn't find where that would be, so I'm going to submit this as a schema issue for now.

This issue seems to have been resolved at some point; I was able to deploy. However, I have a new issue with my personal tab silently vanishing from the manifest, both in the published app and in the manifest within App Studio. I'm making a new issue to deal with that.