Internal Server Error in OAuth for Google - meteor

Question

EDIT: I was able to resolve the original error here when I realized my ROOT URL was set to my IP address rather than my domain. However, I now have a new issue. My client ID is the same as the original post below. This works fine in the local app, but in production, the popup flashes for a second and then the login box displays "Internal Server Error". I can't see any other messages that would explain it.
I am using the service-configuration package to load the settings, as follows:
ServiceConfiguration.configurations.upsert(
{ service: "google" },
{
$set: {
clientId: "************",
loginStyle: "popup",
secret: "***********"
}
}
);
If I add ?close to the end of my Authorized redirect URI, the Google popup comes up with a redirect_uri_mismatch error, showing the URI without ?close. I think there was an issue resolved here but it at least shows me that my project in Google is being recognized.
ORIGINAL POST
I am setting up an OAuth 2.0 client ID for accounts-google in Meteor and am seeing the following error:
400. That’s an error.
Error: invalid_request
Invalid parameter value for redirect_uri: Raw IP addresses not allowed:
http://***.***.***.***/_oauth/google
My Client ID in Google:
Authorized Javascript Origins
http://localhost:3000
http://myApp.com
Authorized redirect URIs
http://localhost:3000/_oauth/google
http://myApp.com/_oauth/google
I understand I must not be properly pointing the domain to the IP address. I have already set up an A record and the site works fine in other regards though, so not sure what step I missed.