IOS 15.1 update caused zwift companion not to work

After my apple update with IOS15.1 my zwift companion app does not open (keep blue screen for hrs) en the main zwift app has a flikkering avator. Re-isntalling the zwift companion app only helps 1x second time I try to open it is is frozen again.

Are there any tips/tricks?

See Companion App blue screen [November 2021]