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You should be able to use a PAT like a password as you've been trying to. I think what's blocking you is your Git version: see this SO question, which suggests that error comes from the Git client ...
Answer
#1: Initial revision
You should be able to use a PAT like a password as you've been trying to. I think what's blocking you is your Git version: see [this SO question](https://stackoverflow.com/a/49109825/3160466), which suggests that error comes from the Git client using TLS 1.0, which GitHub has recently dropped support for. Try to upgrade your Git client version, then try again.