https://www.iu.org/about/quality/ This school keeps appearing in my searches. It's on line European university, with some German accreditation. I'm not familiar with German system. I.U. - International University The name reminds me some less then wonderful schools.
It's the private university with the most students in Germany (among the private universities, of course there are bigger universites). Fully state-recognized. And one of the few gernan universities which is addressing the global market.
We discussed these guys here: https://www.degreeinfo.com/index.php?threads/iu-applied-sciences-50-off-tuition-until-july-14-online-programs.61261/
Yes, they've been talked about on this and the sister board... Apparently, they take a long time to get back to you, I would have them as a backup option though!