Okay, found A issue and it’s not your’s @Richard_B ..
The Copy button in Volvos API page doesn’t copy the actual value.
Seen this in Atlassian as well using a chrome based browser.
Pressing the copy button give you one value..
Viewing the key and then marking and copying actually gives you the key in the field.
I added the API key in the app’s settings. Then try to add the device. After logging in with my Volvo ID I get a “Token refresh failed” message. I have app 1.6.6.