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. Try resetting the Advanced tab on UM settings page.
2. Turn ON "Stop rewriting rules on every load" in Ultimate Member > Settings > Advanced or turn OFF if you turned them on.
3. Check your permalink structure/format in WP-admin > Settings > Permalinks > Common Settings > Choose “Post Name” as the base name format /%postname%/ .