Resubmit an app to Google Play
I found the solutions to this Problem.
Steps to follow
Under Pricing and Distribution, check "No" to "Primarily Child-Directed" and click on "RESUBMIT APP".
Then go to "Store listing" and give your privacy and policy URL and click on "RESUBMIT APP".
Now go to Pricing and Distribution, check "Yes" to "Primarily Child-Directed".
Click on "Opt in to Designed" for Families" and click on "RESUBMIT APP".
Now you are good to go.
App will be published within an hour.
go to "Store listing" and click on "RESUBMIT APP" Now "RESUBMIT APP", will be disabled and grey, so, There will be questions asked such as price, does app contains ads or not, so select yes if you previously selected no and vice versa, now that resubmit button would be blue, and then change back to original settings of yes or no and click on resubmit app, it will show rejected on dashboard, but on clicking on app, you will see status of processing under rejected, confirming that app has been resubmitted.
A possible way to resubmit a rejected update
• Sign in at Google Play Console.
• Select your app for resubmission.
• Go to "Store presence" > "Main store listing".
• Make a minor change at the store listing to activate "Save" button. For example, add a space after app title or description.
• Click "Save" (after saving you may undo your minor change and click "Save" button again).
• Go to the rejected update and click "Send for review" button.
Done.
As of 10/1/2020, it would appear access to the Resubmit App action is managed via the Publishing Overview > Managed Publishing Status option which is set to "automatic" by default.
My understanding is that the "automatic" setting will automatically resubmit any updates.
I had an app get flagged and, even after the automatic update/resubmit I was still seeing all the flag warning messages. Very confusing IMO.