ERROR: Repository not found

Hi team,

Got a quick question, since I updated my credentials with ssh, my gitHub work has been dream-y.
However, all of sudden it’s throwing tantrum especially when I try to push to the repos with error

ERROR: Repository not found.
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

Interestingly current work is not being affected BUT new works are being affected. No prob cloning down and add and commit but git push is being denied with error msg above. I’ve been googling like crazy but nothing worked. Any solutions?

FYI, operating system, MAC OS High Sierra/ver 10.13.6

Please help,

sjb3

Plus, when I run ssh -T git@github.com in terminal,

I get correct response, Hi sjb3! You've successfully authenticated, but GitHub does not provide shell access.