On this page:
https://docs.mongodb.com/stitch/tutorials/guides/todo-guide-google/
In the section
- Create a project in GCP
You have:
- For Authorized redirect URIs, enter the following:
https://stitch.mongodb.com/api/client/v2.0/auth/callback
You need to add:
https://eu-west-1.aws.stitch.mongodb.com/api/client/v2.0/auth/callback
if your project runs in eu-west, and probable other as well depending on where it runs.