How do I permanently remove a Behance project co-own request from Creative Cloud?

Two years ago I deleted my then account on Behance. Around a year later, I signed up once again but ended up deleting this account as well.

Today, whenever I log into the Creative Cloud-app for Mac I'm receiving an old request to co-own a project by one of my previous contacts on Behance. I press "reject" every time, but the request still comes back. How do I permanently remove this request?