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Trouble with mailchimp oauth 2.0 setup

Hi all,

I’m having trouble setting up mailchimps oauth 2.0 call. I’ve set it up exactly like others have done via bubble, but I can’t even get the API redirect to work correctly. I’ve been slamming my head at this for a while now, and not sure why I’m finding it so complicated. I complete the configuration, test the workflow in debug mode and then get the error below. Any tips?