With referece to this post by sinehelth dated 14 jan 2021


Common practice for a 'complete unsubscribe' from a subscipriton center is to open up a quick 'sorry to see you go' survey page on submit.This is currently not possible with standard Marketing features.

Please consider adding this in a next release.

Thank you in advance.

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Ideas Administrator

Thank you for your feedback. Currently this is not on our roadmap, but we are tracking it, and with more feedback and support from the community we may consider it in the future. Sincerely, Kevin Woley, Microsoft