I think you’re right. My guess would be those two symptoms share the same root cause.
Wonder if this explains the spate of certificate errors I saw earlier today regarding presence.teams.microsoft.com?
Microsoft is aware of an issue with the Presence feature in Teams and working to fix it.
Teams users currently cannot view other users’ presence information or update their own.
See below for the latest update from Microsoft (as of 4:45 on Tuesday afternoon).
-Peter Brooks - SAA
All users can't view or update user presence in Microsoft Teams
TM212081, Microsoft Teams, Last updated: May 5, 2020 4:38 PM
Start time: May 5, 2020 3:55 PM
Users are unable to view or update user presence in Microsoft Teams.
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Title: All users can't view or update user presence in Microsoft Teams User Impact: Users are unable to view or update user presence in Microsoft Teams. More Info: Users will see a "Status Unknown" message when attempting to view another users status. Current status: We're investigating a subset of infrastructure responsible for processing presence request traffic. Scope of impact: This issue may potentially affect any of your users attempting to look up or update user presence. Start time: Tuesday, May 5, 2020, 3:21 PM (7:21 PM UTC) Next update by: Tuesday, May 5, 2020, 5:30 PM (9:30 PM UTC)