Took me about 2 days since requesting Unlisted App distribution.
Process was
Submit an already rejected App -> Immediately submit Unlisted App form -> App rejected by 3.2 guideline -> Wait untill Unlisted App got approved (for me 2 days) -> Unlisted App Got Approved -> Resubmit App (with note indicating your app has been approved for Unlisted App). Hope this helps
flutter_dev01
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