AVM Fritz Binding cant connect new decives anymore. But working with existing

[WeRo (Welf)]

Looks like I am facing the same problem.
All 301 are unknown and adding new things results also in status unknown.
Did you find any final solution?

AVM Fritz Binding things unknown after upgrade OpenHAB 2.5 to 3.4

Hi, I just upgraded from 2.5 to 3.4 and now I am facing some strange behavior. I have four contacts and three Fritz 301. All were running in 2.5. without any problems. After the upgrade to 3.4 I have these issues: All of the contacts are online but one of them has the status of the channel/linked item „NULL“. Opening and closing of this contact doesn’t change it. Even deleting and adding the thing newly doesn’t fix it. All of the three Fritz 301 are unknown. They don’t send data but strange…