@candrea try uninstalling the openhab cloud connector binding then delete the UUID. Stop OH, clean the cache and restart. Then reinstall the binding to have it generate a new UUID and see if that works.
To clean the cache:
sudo systemctl stop openhab2
sudo openhab-cli clean-cache
sudo systemctl start openhab2
or
sudo reboot
Also, the UUID location is /var/lib/openhab2/uuid