Keybase unreachable github problem

Hi, i have a problem with link my github account as a proof to Keybase.io it says me it is unreachable does anybody knows why it says me like that?

Start by reproducing the GitHub account linking flow described in the issue and tracing the Keybase client path that reports the proof as unreachable. No file or test is identified, so done would require determining the cause and confirming that a GitHub proof can be linked successfully.

Written by the indexing model from the issue text.