Sync not working under Mac OS 11.4

Since Im using MAC OS 11.4 Big Sur on my MacBookPro Sync functions are frozen

Unable to leave sync chain
Unable to remove devices from sync chain
Unable to start a new sync chain

Brave Version 1.26.67 Chromium: 91.0.4472.114 (Offizieller Build) (x86_64)

MacBookPro 13inch 2020 Intel
Blackberry Keyone with Android 8.1.0 (ABT975)

Additional Information: