Repository mirror with custom SSH port

Hello,
I’m attempting to add a push repository mirror with our cPanel webhost, and have been unable to get past an error. Webhost has SSH enabled on a custom port and a new repository created. Any insights would be appreciated!

Reference:

What I’ve done
Adding the remote repository succeeds
SSH access confirmed on webhost
SSH public key authorized on webhost
Updating the repo mirror will timeout and fail with an error

Error pushing to remote repository, using password auth:
2:Fetching remote remote_mirror_ID failed: Could not resolve hostname server.domain.com:222: Name or service not known fatal: Could not read from remote repository. Please make sure you have the correct access rights and the repository exists.

Error pushing to remote repository, using SSH auth (pub key authorized at webhost):
13:close stream to gitaly-ruby:rpc error code = Unknown desc = Gitlab::Git:RepositoryMirroring::RemoteError: Host key verification failed. fatal: Could not read from remote repository. Please make sure you have the correct access rights and the repository exists.

Thanks,

Well, it appears the “hurry up and wait” adage applies here.
Left the configuration in place overnight (actually for a week) and the GitLab repo has been push mirrored to the remote cpanel repo. Could be a delay in the GitLab ssh host key updates or something else. Bottom line, if you have found this post and have the same issues, one suggestion is to simply wait a period of time. Cheers