If you have access to multiple AdSense accounts from the same email address, you’ll be asked to select the one you want to use when you sign in to AdMob.
Upon sign in, select the publisher ID for the AdSense account you want to use for this AdMob session. Note that you’ll be asked to select an AdSense account each time you sign in to AdMob.
Switching between AdSense accounts in AdMob
To change the AdSense account you’re currently using in AdMob, sign out of AdMob. When you sign in again, select the AdSense account you’d like to use for this AdMob session.