Keep one message app in mobile. And wait for 7 days. After using 1 app for 7 days without switching to other (either Samsung or goggle) chat regurgitation will open for your number.
The problem you are facing always occur when same number chat request is sent from 2 apps. Google messages app and Samsung messages app, as they both provide chat services. Database clears after 7 days. Only solution is to wait for 7 days now.
