I think you’re referring to a nip-05 address. I don’t think Damus provides Nip-05 addresses, so it’s likely you did actually put in something that isn’t a Nip-05 address. You can set one up on your own domain which is better than paying for one on someone else’s domain.
https://github.com/nostr-protocol/nips/blob/master/05.md
Using one of my own domains would be awesome
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Let us know if you need help. I recommend adding hashtag #asknostr when asking questions for wider visibility.
Thanks for the letting me know, I’ll make sure I follow that hashtag so I can learn some more I’m probably missing