Tried everything in this thread but for me, clearing all cache and personal data worked. Just go to your phone companion app on your smartphone and clear all cache and storage data. Post that, try again through the QR Code being provided in your laptop or PC.
Also, please make sure all permissions are provided to your phone companion app in your smartphone, as without it the app might not be connecting with your laptop or PC.
Please try and let me know if any further issues crop up.