Activity is not being saved in Zwift

Dear Zwift-Forum,

since yesterday, my activities in Zwift are not being saved in the program. My setup:

Wahoo KickrCore
Ipadpro with IOS 14.7.1 with the latest Zwift update
Connection via bluetooth

Only thing I changed since the last sucessful use of Zwift is the new garmin bluetooth heartfrequence-belt. There is a .fit -file from the session from yesterday (it was an ftp-test) in Zwift, but I cannot see the activity.

Any help would be appreciated, im so dissappointed because I was all out in the test and improved my ftp +11 but now its not shown anywhere.

Greetings

Dirk