Forward user after authentication of Google Device - rest

Question

I have users that link their Google suite account using the OAuth2ForDevices approach. After linking the account to the device I would like to forward the user to another page with instructions instead of leaving them at the generic google page "Success! Device connected".
This is the current flow:
1) Grab device_code and user_code from POST to URL: https://accounts.google.com/o/oauth2/device/code
curl -X POST \
https://accounts.google.com/o/oauth2/device/code \
-H 'cache-control: no-cache' \
-H 'content-type: application/x-www-form-urlencoded' \
-d 'client_id=<hidden>&scope=https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fcalendar'
response
{
"device_code": "ab-cdef...",
"user_code": "ABCD-ABCD",
"expires_in": 1800,
"interval": 5,
"verification_url": "https://www.google.com/device"
}
if i append parameters like foo=bar or forward_url= the response is still the same as above.
redirect_uri=http://localhost:8080 it results in an error, so this parameter is obviously recognised.
{
"error": "invalid_request",
"error_description": "Invalid redirect URI"
}
The problem does not seem to be the URL since the following request works fine: i managed t
https://accounts.google.com/o/oauth2/auth?response_type=code&client_id=<client_id>&redirect_uri=http://localhost:8080&scope=https://www.googleapis.com/auth/calendar
2) Let user confirm verification_url (https://www.google.com/device)
3) "Success! Device connected"
I have tried with a bunch of domains and URL:s that has been confirmed in both google search console and added to domain verification in https://console.cloud.google.com
Worth mentioning*: I noticed that Google Cloud Platform behaves in a strange way, removing earlier verified domains -- when I'm adding new domains: https://console.cloud.google.com/apis/credentials/domainverification?project=&pli=1&authuser=1
My theories:
1) It's simply not possible to add a redirect_uri when using the OAuth2ForDevices approach.
2) There is a bug* in Google Cloud Platform that displays me domains but this is cached data.
*Buggy?? Google