Zoom Group-Assigned App Access Stopped Working Without Change or Audit Log

[Titanium-Monkey]

Hello,
We're an approved app on the Zoom Marketplace. One of our customers provisioned Our App to a user group with the setting: “As an admin, add Our App for Selected Users & Groups.”It worked fine for several months.
Two weeks ago, all 5 users in that group lost access and were unable to reconnect. There was:

• No change to group membership
• No visible admin changes
• Nothing in Zoom’s audit log

However, after stepping through Zoom's “Manage → Apps on Account → Our App → Users & Groups → Add Groups,” the issue was resolved. They only then saw the "Selected Users & Groups" assignment path again.

We’d like to know:

1. What would cause the “Selected Users & Groups” app assignment to stop applying to an existing group?
2. Is there an expiration or condition under which group-based app installs are silently dropped or invalidated (e.g., inactive use, policy refresh, token purge)?
3. Are there platform logs from Zoom’s side that indicate whether this permission was revoked or expired?
4. Is there a recommended way to monitor or proactively get notified if a group-level app assignment breaks?

Thanks.