are you paying from the same wallet or different wallets?
What's strange on Amethyst is that depending on the account I'm trying to send a zap, I can get an error message like this one, or not.
I'm not sure it's specific to Amethyst or maybe it's a broader nostr thing, but as Amethyst has multi accounts support this is where I noticed it. nostr:nprofile1qqsyvrp9u6p0mfur9dfdru3d853tx9mdjuhkphxuxgfwmryja7zsvhqpzamhxue69uhhv6t5daezumn0wd68yvfwvdhk6tcpz9mhxue69uhkummnw3ezuamfdejj7qgwwaehxw309ahx7uewd3hkctcscpyug

Discussion
Same Wallet. Bitkit Wallet FYI
Will try with another one to see if it changes something
My bad.
I can't even tell if it's the same as I get the error message before being able to choose a wallet from the list.
All I know is that I use Bitkit with the account that works, but it could be any other one