Add me

I was having the same issue... but if you can remember the username and then go to the friends tab, then click the plus sign. You click on find by fitness pal username and then type their username there. Takes a few extra steps but that way has been working for me!
Sometimes the friend stuff glitches on this app for me... like adding friends, posting on walls, replying to PM’s and I still haven’t figured out how to post a pic without updating my weight lol
Good luck!