You must have administrator or manager permissions in AdMob and standard or administrative access in Google Ads to unlink your AdMob account from a Google Ads account.
Additionally, you must pause or remove all active campaigns before unlinking.
To unlink your Google Ads account:
- Sign in to your AdMob account at https://admob.google.com.
- Click Settings in the sidebar.
- Click the Linked services tab.
- In the 'Manage account links' section, click in the Google Ads row.
- Click the toggle to unlink to a Google Ads account.