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Cannot deploy to live "we had an error deploying"

I’m in a bit of a pickle.
I switched to Firefox to get around the current issue of not being able to login as user.
But when I try to deploy some fixes I get this message and when I sync my changes are reverted back to the bug I was hoping to fix in live.
So I go back to Chrome/Edge and now I get this error message when I try to do the same deploy.
So my client is stuck with a bug that I have fixed but cannot deploy.
Any assistance will be appreciated.