Urgent Please help fixx message issue

[Hamza2]

I accidentaly choose Nevwr Allow how can i fix this

[Hamed1]

As i know, due to some policy on marshmallow, it cannot be undone unless we format the phone.

[DavidfromSam]

what if you block the number from the messages app

[MahmoodAlmas]

I think you can clear the data to reset the app for you