I too used grapheneos for a long time, but WhatsApp just give me a message about WhatsApp being unofficial, and I downloaded it form Google Play, Aurora and official web site on different installations. I tried to start it from backup, but the problem persisted.
Does it refuse to run if it detects root? Im not rooted but grapheneOS lets me run whatsapp no problem.
I too used grapheneos for a long time, but WhatsApp just give me a message about WhatsApp being unofficial, and I downloaded it form Google Play, Aurora and official web site on different installations. I tried to start it from backup, but the problem persisted.