It's mentioned a little in the comments, but it's not explicitly mentioned...
Follow Testing your SSH connection to verify the connection by ssh alone.If this does not connect, git or github may not be very relevant and may be an environment where ssh connections are not allowed.
If your browser can connect to https://github.com/, consider switching to https connection instead of ssh connection.
P.S. By the way, Desering is a registered trademark of KDDI.
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