One thing to bear in mind is that the ssh config setup (specifying which identities to use for which hosts) is important here. I've seen situations where having too many personal keys (in your ~/.ssh/ directory) caused login failures (when not IdentityFile is passed, the ssh command will offer them one by one to the remote, and the remote will interpret this as a brute force/too many failed logins attempt).
It's possible adding a host: * section with a preferred default key may be all that's needed to address that.
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One thing to bear in mind is that the ssh config setup (specifying which identities to use for which hosts) is important here. I've seen situations where having too many personal keys (in your ~/.ssh/ directory) caused login failures (when not IdentityFile is passed, the ssh command will offer them one by one to the remote, and the remote will interpret this as a brute force/too many failed logins attempt).
It's possible adding a
host: *section with a preferred default key may be all that's needed to address that.