I can’t log in on my iPhone it’s all grey out
I can’t sign into my Apple ID from my iPhone
Question marked as
Have you checked Settings/Screen Time for any restrictions?
Try a restart.
Restart your iPhone, iPad, or iPod touch
Try a forced restart.
If necessary
If you have Screen Time restrictions, you will need to restore the device to factory settings. Do not restore from a backup made when the Screen Time code was active.
If you don't have Screen Time restrictions, do a backup and try a factory reset. Then restore from your backup.
Backup - Restore your device from an iCloud or iTunes backup