Integration with Google Adwords

Hi, We have an MCC account in Google Adwords, meaning we have several Google Adwords accounts all under one parent account. When trying to integrate Marketo with Google Adwords according to their documentation it doesn't show the screen in which we need to choose which accounts to sync. With or without a connection to it, it seems the conversions are only marked partially in Adwords even though we know we had conversions and people in every stage in our revenue cycle model in Marketo. 

Does anyone here have an idea what's the reason for this? We spoke with Marketo's support and Google Adwords's support but to no avail. Thanks.