When I switched to a new android phone (from Samsung M51 to Samsung F62), despite the Smart Switch data transfer and encrypted back up on Google Drive, it always showed 'connection error' and suggested to 'try later' for restoring the back up. I finally gave up on restoring the back up. But, it's not even initializing now. I am not able to use WA on my new phone. Also, in the old phone, my WA is still active. I tried clearing cache, uninstalling WhatsApp, restarting phone etc., nothing worked.