Hi Xavier,
Thank you for reaching out to us.
In order for you to link your app, the team have updated the AdMob UI’s app linking page recently and it is now possible to link your App using your Play Store's URL. That said, please try linking your app using your Play Store's instead. For the unlinking of your app, as far as I know you are not able to unlink your app once you already link it to your AdMob account, you can just hide it as per this article.
Regards,
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