Search for their username in VRChat
Check whether their profile appears normally
Try opening their profile from a world, instance, or friend list
Look for missing profile details or unavailable actions
See whether their avatar, name, or status fails to load as expected
Try sending a friend request or invite if applicable
Check whether you can join their instance or interact with them normally
Ask a mutual friend to check whether the user appears visible to them
Review your blocked users list in VRChat settings
Unblock the user if they appear in your blocked list