In order to authorize Google Ad Manager the user integrating must have permission to view and manage campaigns in the Google Ad Manager account being connected.
How to connect Google Ad Manager
First, navigate to the campaign you would like to connect Google Ad Manager in, then click Integrations in the sidebar to the left.
Next, on the integrations page either click Paid Ads and look for Google Ad Manager, or search for Google Ad Manager in the upper right search box.
Once located click the Google Ad Manager tile to open the connection wizard then click Connect New Account.
If this is the first you've connected a Google Ad Manager account or you're connecting a new Google Ad Manager account, click Connect New Account at the bottom.
This will launch an authorization window where you need to select the associated Google account.
On the following page, click Allow in the bottom right to allow AgencyAnalytics to access the Google Ad Manager account information. The authorization window will load for a moment before closing.
The connection wizard will redirect to the connection list after authorization. Locate the account in this list, then click the circle to the left of the account to select, before clicking Connect in the bottom left.
Google Ad Manager is now successfully connected. You can check out the prebuilt integration dashboard, or start adding widgets to dashboards and reports!