Ticket created by ~angdraug on ~sircmpwn/meta.sr.ht
When I tried to paste my public key into the signup form, it was rejected as invalid,* but once my account registration was completed I was able to add it via https://meta.sr.ht/keys without any problems.
(*) Not sure if worth a separate ticket, the UX flow for invalid key was confusing and took me some time to figure out: it reloaded the signup form with the PGP key section collapsed, I had to expand it to notice the error message.