Authentication failed error when adding repository with SSH auth
I am trying to add repository via Xcode > Settings > Accounts and I am stuck on the proper address. Address of our repo is quite simple: my.domain.com:port/project-name. Authentication via SSH Keys. Could someone help me to understand what's going on here? See screenshot below.
By the way running git clone git+ssh://git@my.domain.com:port/project-name works fine.

EDIT
Running git clone without git+ssh//
git clone git@my.domain.cz:2222/project-name
or
git clone git@my.domain.cz:22/project-name
is giving me same error:
ssh: connect to host my.domain.cz port 22: Connection refused
fatal: Could not read from remote repository
Please make sure you have the correct access rights and the repository exists.
 Xcode accepts just ssh://git@my.domain.cz:2222/project-name .  
 The git protocol is somehow redundant in this case.  Raw git tools don't have a problem with it, but Xcode does not like it for some reason.  
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