My Nostr profile e.g. on NoStrudel, username or display name? Sorry if this is a stupid question but I'm a noob and nostr is still confusing.
Discussion
You can match your profile information at https://nostrplebs.com/manage including the wallet.
That's where I was 'manage my profile on Nostr Plebs' but it just came up with that error. After Semisol's reply I went to NS, changed my display name and/or user name, waited - et voila! No idea. Nostr doing Nostr things.