Oh dear. You're already subscribed to the relay, remember? It shouldn't be letting you subscribe again, since your hex npub is already listed.
nostr:npub10npj3gydmv40m70ehemmal6vsdyfl7tewgvz043g54p0x23y0s8qzztl5h can you straighten this out and get Matt a NIP-05 address, please, and refund him the difference?
Sorry for the confusion, Matt!
