Please try connecting to the phone with the phablet-shell command and run this:
OAU_LOGGING_LEVEL=2 OAU_DAEMON_TIMEOUT=9999 online-accounts-service
Then try creating the account again in your phone (using the suggested minimal path), and you should see some output from the command above. If you could then attach that output to this bug, that should show us what exactly is going wrong.
Please try connecting to the phone with the phablet-shell command and run this:
OAU_ LOGGING_ LEVEL=2 OAU_DAEMON_ TIMEOUT= 9999 online- accounts- service
Then try creating the account again in your phone (using the suggested minimal path), and you should see some output from the command above. If you could then attach that output to this bug, that should show us what exactly is going wrong.