gh mintty
MinTTY is the terminal emulator that comes by default with Git for Windows. It has known issues with gh's ability to prompt a user for input.
There are a few workarounds to make gh work with MinTTY:
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Reinstall Git for Windows, checking "Enable experimental support for pseudo consoles".
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Use a different terminal emulator with Git for Windows like Windows Terminal. You can run "C:\Program Files\Git\bin\bash.exe" from any terminal emulator to continue using all of the tooling in Git For Windows without MinTTY.
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Prefix invocations of gh with winpty, eg: "winpty gh auth login". NOTE: this can lead to some UI bugs.