Hi Chris. We just had this exact issue. Support looked into it and had to release a patch and it is now solved, they provided the following feedback:
Our Tier 3 team advised that the last error you saw "Oops.. Something went wrong, please contact Marketo Support" when attempting to create and authorize Google Adwords in Marketo was fixed by a patch deployed last night.
Now, before re-attempting to create the Launchpoint service for Google Adwords again, the Marketo App in the Google account must first be uninstalled to avoid receiving the error again. This can be done by going into their Gmail account settings: https://myaccount.google.com/permissions
Once the Marketo App is removed from the Google account, please try and create the Launchpoint service for Google Adwords again in Marketo and let us know how you go.
Thanks for your response to my query - glad to know we weren't the only ones struggling out there!
Seems to have worked now after some discussion with Marketo - so fingers crossed it's smooth sailing from here.
Was your problem solved with a patch as Daniel described above? Having the same issue and Marketo's tech support still doesn't seem familiar with this issue. I'm trying to lead them in the right direction.
I started getting a Google AdWords Authentication Error on 3/2/18 and so I contacted Support. This is the message I received:
We apologize for the inconvenience. This is a known issue where our Engineering team has already been alerted and are working to resolve it. We will let you know of next steps or a complete resolution as soon as possible. Thank you for your patience.