Second Apple ID cannot be created
My partner has performed multiple trials to create an additional Apple ID and always failed.
She has a business iPhone with an existing Apple ID and wanted to create and additional Apple ID for a new privately owned iPhone. She has no further Apple IDs so far.
This was done with new private e-mail address. The Application for the new ID was done in the internet on a Microsoft PC according to the instruction of the Apple online support.
At the end when confirming the e-mail address and phone number the process always ended with "Apple ID cannot be created" withtout further details on error or something missing.
In the online Q/A I found similar cases but with no clear solution.
Therefore I'm posting the question here again with the hope for any similar experience and solution.
iPhone SE, iOS 17