User Profile: Page Not Found
If a “Page Not Found” error occurs when you try to view a Profile page, you can try the following to fix the issue:
1. Make sure that you have correct User page assigned in Ultimate member > Settings > General > Pages
2. Check your permalink structure/format in WP-admin > Settings > Permalinks > Common Settings > Choose “Post Name” as the base name format /%postname%/ .
3. Do a conflict test by disabling all plugins except Ultimate member and switching to the default WordPress theme.