This no longer requires an answer and I don't have time to figure out how to delete the question.
For the benefit of those, like me, that were looking for an answer: https://bitbucket.org/blog/renewing-bitbucket-org-certificates
My issue was finding which .hgrc was being used by the system. There were 2, one in ~/.hgrc and one in <repository>/.hg/.hgrc.
I also found that article above but had to change SHA256 to sha256 on macOS for it to not give an error.
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