Network Policy Server (NPS) does not support the use of the Extended ASCII characters within passwords: I told our customer to avoid ÖÄܧß, but he asked us a complete list of the characters not supported to add the info in the password reminder mail. I didn't find an official list, maybe someone knows all characters list to share?

Not sure myself but maybe this article may help to locate a few: https://forums.ivanti.com/s/article/KB44336?language=en_US

Thanks John. “use the characters present in the table from 0 to 127 https://www.ascii-code.com/“ could be a good answer

No probs