User Management will not save changes

Hello, I just installed and setup a new system. It is running PBX Version:
All of my users were autogenerated when I created the extensions. I was able to make changes to users through User Management but now when I make any change to a user and click submit. I get the following message in a red banner towards the top of the page. “An Unknown error occured while trying to update user data”. There is no further explanation of an issue. The changes I made are reverted.
Any ideas on a possible cause or where to look for more information on the issue?
Thank You in advance.