Can you please share the url of nostr.band where this is happening? Thanks!
Discussion
Happened to me too a few times. Switching the search from npub to nip-05 helped
Basically, it always failed and get this message, idk if that was relateed to my browser configuration.
Here is the url I just teated.
https://nostr.band/?q=%40npub1xdtducdnjerex88gkg2qk2atsdlqsyxqaag4h05jmcpyspqt30wscmntxy
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Sorry, I found that was owing to my browser setting.
I've enabled DNS over HTTPS with dns.adguard-dns.com, and that seems affected the certification on the specified website (which url is in the screentshot of last DM).
After disable DNS over HTTPS, I'm able to search on nostr.band now, thanks for your kindly help.