Can you please check that you've received your individual AdSense invite link? Here is detailed information on how to complete the process - https://support.ezoic.com/kb/article/google-adsense-and-the-mediation-app
If you have already completed this step, it may be that your Adsense account is linked in our Ezoic Adsense account but hasn't pulled through to to the Ezoic system. If you are seeing Ezoic as a third party manager in yoru Adsense account but are seeing LINK YOUR ADSENSE ACCOUNT in your Monetization section this is likely what has happened.
Please reach out to your Ezoic representative or the Twist support community to help get this resolved!