settings > zap settings > custom NWC 

 Make sure your button config looks like this. 
https://image.nostr.build/f9e5c7e0e68653ccf9cf6d8c33523a3d3ab64f65ab88880ea99a984a9dd04328.jpg 

 or this 🫂 

https://image.nostr.build/b67970c7e404c6183ef4fac2d60ed53a9d9353df4c5674f44f30f9d130e7668d.jpg