ssh connection denied

I've created a new account on https://gogs-server.fly.dev/ and added my existing public ssh key to my new account:

- check if I have existing ssh keys on my machine: `ls ~/.ssh` show `id_rsa` and `id_rsa.pub` and `known_hosts` files.
- copy the public key `cat id_rsa.pub` then copy paste the content https://gogs-server.fly.dev/user/settings/ssh

- I've created a new organisation and repository and try to clone it with `git clone ssh://git@gogs-server.fly.dev:10022/theorg/myrepo.git`
However I have the following error:

I'm looking at creating new keys (without breaking the existing one) and to try to setup the new private/public key to be used wit the gogs server only. I think I might need to create a config file to select the correct ssh key depending on the host.