AVM DECT device status UNKNOWN

Dear all,
Recently, I replaced my Fritz!Box 7590 with a Fritz!Box 7590 AX and upgraded my OH 4.1.x (on an RPI 4) to 4.2.1. Since then, all my DECT devices (200, 210, 301) have status UNKNOWN. Everything has worked before the recent changes.

The connection between all DECT devices and the Fritz!Box are alive and the Fritz!Box thing is ONLINE.

What have I done/tried so far?

  • After switching to the new Fritz!Box 7590 AX I brought up the Bridge to status ONLINE.
  • I activated the call monitor and tested it.
  • I linked an item to the channel outgoing_call and can see the activity on this channel.
  • I removed the AVM Fritz! Binding and added it again.
  • I checked the “Bridge” setting for the DECT things.
  • I disabled and enabled the DECT things. The log only says INITIALIZING and after a second or so UNKNOWN.

Has anyone experienced the same problem, or does anyone know how to solve the problem?

Any help is appreciated.

Ferdinand