Try nostr:npub1cm3rpgj7457yjuqnvdalxaauakqu0ndkpkyp5cldkyutpz4xszpsmk96wt and put their lightning address on your nostr profile. Works great. It's my suggestion.
Discussion
Hum, you added speed app lightning address and it's failing.
This is the annoying problem I ran into last time.
What was the problem?