Make SSH Key known to your system

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When using several ssh keys on your Mac, you need to give them distinct names, and in therefore you may encounter a problem: The system may not use the key, because it does look for the standard names only*. Happened to me, when I set up a ed25519 key for my university Gitlab account. Even after adding the ssh key to Gitlab, it would keep asking me for the password, when I tried to connect with ssh -T git@gitlab.example.com

*) You can watch this behavior by typing ssh -vvv git@gitlab.example.com into your terminal.

Solution: Just make the system aware of your key by

ssh-add -K ~/.ssh/my_special_keyname

Starting from macOS Monterey (12.0), the -K flag is deprecated and has been replaced by the --apple-use-keychain flag:

ssh-add --apple-use-keychain ~/.ssh/my_special_keyname