I also posted a new topic on this, as our situation appears to be a little different, but I wanted to add it here as well.
We have a multiple meeting SDK apps that are no longer joining meetings as of this morning. We have verified that they can join meetings from their own account, but not external meetings. The SDK returns error 63.
These are apps that have been approved in the Marketplace. We are aware of the recent changes that require apps to be approved in order to join external meetings, but these apps have been approved for a long time. We never received any notice about them needing to go through the approval process again and there is no indication in Marketplace that any action is needed.
Please help as this is affecting us in production.