Adding any user in the user group settings manually - not possible

When I want to add users manually to a user group, it only shows me users until the letter S. Afterwards, none of the users can be found. I think there is a limit of how many users can be found there.

How can I go about adding the users there?

I think Softr stops at 10,000 users, that might be the issue?

Thanks so much in advance! :slight_smile: