Problems after migrating a resource from Notes to M365 when rescheduling an appointment

We have a room in HCL Notes that contains both appointments via HCL Notes and M365 via coexistence

After we migrated the room to M365 we have problems moving appointments.

The appointments can be moved without an error message, but in the room calendar they are duplicated (at the old and the new time)
Is there a solution to solve this problem?

  • I faced a similar issue when we migrated our room calendars. It turns out, sometimes the sync between HCL Notes and M365 can create duplicates, especially when moving appointments. What worked for us was clearing the cache on both systems and then doing a manual sync. Also, check if there's a setting in M365 that's causing the duplication.