please ensure you have GUI access enabled on the interface.
You can do this via CLI:
#config system interface
#set allowaccess ssh https-gui
--> the correct allowaccess setting varies depending on firmware version of your FortiAuthenticator; you can do 'set allowaccess ?' to see the available options; you will want 'https' or 'https-gui' for GUI access.
+++ Divide by Cucumber Error. Please Reinstall Universe and Reboot +++