.well-known/acme-challenge path access 404

I'm sure there is a lot more to the config that you haven't shown.

Try this:
mkdir -p /var/www/certbot/.well-known/acme-challenge/
echo "Test_File-1234" > /var/www/certbot/.well-known/acme-challenge/Test_File-1234

Then (from Internet):
http://sanyoeng.com/.well-known/acme-challenge/Test_File-1234

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