Dear InSync,
I got this one today.
Failed to fetch http://apt.insynchq.com/mint/dists/tessa/InRelease 403 Forbidden [IP: 143.204.214.39 80]The repository ‘http://apt.insynchq.com/mint tessa InRelease’ is not signed.
Will there be a day without an radical issue?
Tagging our engineer @Kurt_Ko for further assistance. 
and?.. The same problem 
It seems that it happens sporadically. I cannot figure out any pattern. Sometimes it happens in my office, sometimes not, sometimes at home, sometimes not…
@Kurt_Ko, are you alive?
To be honest, this is nothing special, just a glitch.
We’ve updated our repos and it should work now. Can you try again and let me know if it works?
Thanks!
it’s ok now! Thanks!
@Kurt_Ko
It seems fine now! Thanks!