ssh keys don't work for gitlab?

Hi,

I'm trying to post the patch that fixes https://bugs.kde.org/show_bug.cgi?id=394119 to a fork of plasma-desktop I just made, but git keeps throwing 'Host key verification failed' at me despite adding two of my ssh keys to my account.

Am I doing something wrong?

terminal:

$ git remote -v
fork    git@invent.kde.org:michaelmoon/plasma-desktop.git (fetch)
fork    git@invent.kde.org:michaelmoon/plasma-desktop.git (push)
origin  https://invent.kde.org/plasma/plasma-desktop.git (fetch)
origin  https://invent.kde.org/plasma/plasma-desktop.git (push)

$ git push --set-upstream fork feature/TaskManager_unhide-on-attention-option_bug394119
Host key verification failed.
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

$ cat ~/.ssh/id_ed25519.pub
ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIJcMTQFGwhpYUgs04e2G8Jy98N+qMhPQ5O4+QACO697r triffid@dorellan

https://invent.kde.org/-/profile/keys :

Your SSH keys

triffid@dorellan 81:5c:4b:b7:1e:4d:6d:66:04:13:1e:5b:fa:9d:73:17
Last used: Never Expires: Never Created 28 minutes ago