To correct the error and ensure that Google Drive works correctly:
  1. Go to Core > Settings
  2. Click Google Drive
There is an additional step that was omitted from the instructions in step 4:
  • The Authorized redirect URIs are also necessary
  • Therefore, you want to add http://yourschoolname.myschoolapp.com/oauth2callback to the Authorized redirect URIs
  • To do this navigate to: 
  1. Google as the Admin Account
  2. Select API Manager > Credentials using the menu on the left
  3. Choose the Credentials option
  4. Click Edit next to the Project listed in the "0Auth 2.0 Client ID's" section
  5. Enter the following URI http://yourschoolname.myschoolapp.com/oauth2callback
  6. Click Save
Authorized redirect URLs

There is also an error in step 5 of the Google Drive setup instructions.
You will see "Under Accept requests from these HTTP referrers, enter your web site domain, surrounded by wildcards"
  • The example given is *.yourschoolname.myschoolapp.com/* This is incorrect and needs to be changed
  • The correct referrer is actually https://yourschoolname.myschoolapp.com/*
To do this navigate to: 
  1. Google as the Admin Account
  2. Select API Manager > Credentials using the menu on the left
  3. Choose the Credentials option
  4. Click Edit next to the Project listed in the "API Key" Section
  5. Edit this to the following https://yourschoolname.myschoolapp.com/*
The below image is an example of the correct format
Error in Step 5