I copied and pasted my Primal lightning address into my Damus zap line in settings and that worked for about nine months or so until I got Alby hub connected. Before that I tried to connect my cash app and I just couldn’t get that to work. I also do not do it in the connect wallet setting. I do it in the zap setting. Hope this makes sense. 

 There is no place to past in zap line 😀 

 Try profile
Then edit button 
Then paste lightning address into bitcoin lightning tips line 
If you need me to, I can also do a screenshot to show you what I’m talking about.  Hope this helps.