Github prove identity not working

I created a public Gist, using the GUI client and also the terminal.
This is my Gist:
https://gist.github.com/santiagocasas/c2518d286a015f755271ae9370adfb32

On my profile I see: Unreachable

Start by reproducing the identity-verification report with the linked public Gist and inspect the profile state that shows "Unreachable." The payload names no source files or tests, so first locate the code handling GitHub Gist identity proofs; done means the profile correctly recognizes this proof or reports a clear reason it cannot.

Written by the indexing model from the issue text.