Unfortunately, this did not correct the issue. I cannot "re-authenicate" with Google. I have deleted the google credentials config and tried to recreate it but I get an error when Google tries to authenticate the callback .
I have made the hosts entry and when I type in http://node-red.example.com:1880, I do get the Node-RED UI.
UPDATE: I forgot that I had to do the URI authentication step from the computer that NR is running on. Once I did that (and the status of the project was "Testing"), everything worked.
