Why Can't I Connect Amazon Advertising to Pipedream Despite Setting the Correct Allowed Return URL?

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Unable to connect Amazon Advertising to Pipedream, I’ve set the Allowed Return URLs to: https://api.pipedream.com/connect/oauth/oa_gBBiN2/callback as instructed. However getting the following error:

Hey Karim, I see the exception for you, will DM you.

Thank you