Error message when trying to update birth date for child
My children already have Apple Id.
I'm setting up Family Sharing, and have added them to the Family using their Apple Id.
The year of birth isn't associated with their profile (guess it wasn't necessary at the time of creating the profiles).
So I try to update the year of birth, following the instruction provided on several Apple Support pages, e.g. Family Sharing and Apple ID for your child - Apple Support that says "If your child already has an Apple ID, you can update their email address, date of birth, security questions, and more." (date of birth => link: Update the birth date associated with your Apple ID - Apple Support)
BUT no matter where and how I try to update the year of birth, I get the error message, that it can't be updated for the time being ...
(screenshot in Danish wording)
How do I update the year of birth? Or when will it be possible to make the update?
Regards,
Michael