I had the same issue and for me I think I fixed it by switching browsers I was using.
I've been using nostr:npub12vkcxr0luzwp8e673v29eqjhrr7p9vqq8asav85swaepclllj09sylpugg for my primary nostr client. I'm trying to update my Primal lightning address and getting this error. What am I doing wrong?
I had the same issue and for me I think I fixed it by switching browsers I was using.
I'm using the iOS app mostly. I guess I can try in the browser...