Hi!
I am observing similar behaviour!
When using:
https://graph.microsoft.com/v1.0/users/[USERID]/presence/setPresence
The result is 200OK but it wont change the presence
However, when using
https://graph.microsoft.com/beta/users/[USERID]/presence/setUserPreferredPresence
This is also responding with 200OK, but this one is working as expected.
But, when i try to change the presence to busy/inacall, this is not working (Bad Request - 400) via setUserPreferredPresence, but with setPresence (200 OK - Although it wont change the presence in the client)
/br
Dustin