I finally solved the execution failed: 80 issue.
Here’s what I did.
(Steps 1-3 are optional)
(1) turned remote access off (Dashboard > Settings > General > (Cloud Access)
(2) rebooted (Dashboard > Settings > Utilities > Reboot)
(3) turned remote access back on.
(4) Go into the dashboard, into the User section and click on your user. Make sure you enter your email address into the email field.
Mine was blank. When I entered my email, I was finally able to remotely mount non-public shares and no longer got the error “execution failed: 80”.
Hope this helps someone.
