During the Apple Developer Program enrollment you have to enter the "Legal Entity Name" of your company. It should "Include the entity type, such as Inc., LLC, GmbH, etc.", but I can't enter the legal entity name correctly, since it contains the special character "ä" (which is not supported in the input filed). This is a typical letter in german entity names, because of the common entity type "UG (haftungsbeschränkt)", which means something like "entrepreneurial company (limited liability)".
I wouldn't mind and just enter "CompanyXY UG", but the problem is, that you have to enter the "D-U-N-S® Number" on the same page. When submitting the form, apple checks if the entered legal entity name is equal to the entity name which is deposited at D&B at the entered D-U-N-S® Number. The deposited name is the real legal entity name "CompanyXY UG (haftungsbeschränkt)". So... I think this means it is impossible that the entered name and the deposited name will ever be equal. Thus I can't create an Apple Developer Account for this company, which I can't imagine.
I appreciate any advise! I would guess many german companies (UG's) would face this same issue.
Similar question but no solution: https://discussions.apple.com/thread/2675743 (10 Years ago!)
I replaced the special character ä with a and it did work. (Thanks to luk2302's comment.)
Previously I tried to replace it with ae, ä, ä and , but all of this variations didn't work - and I forgot to test a simple a...