how do I update Apple ID on my Mac book it is showing the new id on desktop and phone?
If you have changed your ID or password, have you followed the steps in this article?
What to do after you change your Apple ID or password - Apple Support
Are you sure you are using the correct password? Have you tried the current password?
Enter the Apple (iCloud) ID and click Forgot Password.
Try a restart.
Restart your iPhone, iPad, or iPod touch
Try a forced restart.
If necessary
Do a backup and try a factory reset. Then restore from your backup.
Backup - Restore your device from an iCloud or iTunes backup
I updated my Apple ID on my iPhone and now it won't let me change it on my iPad. It keeps showing my old Apple ID and wanting the password for it but it keeps not excepting it.
update Apple ID on a device not showing new apple id
