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Voor als de MC Connect niet meer werkt:
https://help.salesforce.com/articleView?id=mc_co_clear_invalid_tokens.htm&type=5

First step:
Follow these steps to reconnect your API user.

Log into your Sales or Service Cloud org as the Marketing Cloud Connect admin.
Navigate to Setup > Remote Site Settings and verify the Remote Site Setting “OAuth_Login” is set to “Active”.
Navigate to the Marketing Cloud Settings page.
Click on the Change API User link.
Re-enter your Marketing Cloud API user credentials.