I had the same experience, couldn't get it to sign any events. I put it down to teething issues. Nsecbunker was also not 100% reliable.
Which app did you try it with?
iirc I was trying it with nostrudel
Could you please try again on next.nostrudel.ninja? It is a coming-soon version of nostrudel where several bugs have been fixed, try the 'Nostr Address' option to login with your name@nsec.app
I just chose nsec.app as provider, which choice gets registered. But beyond that, paste doesn’t work, nor does the keyboard stay showing for text input.
This is when trying to login to NoStrudel on Android.
Try your name on this screen https://next.nostrudel.ninja/?#/signin/address