Over the past few days I have not been able to receive notifications for messages from my most frequently used group.  After some digging, I found that notifications for that group have been blocked.  U don't know how I unintentionally blocked it and I can find no options to unblock it.  I've tried to research online, but find nothing.  This is a critical communication channel, and I need to know how to fix this.

Any assistance is welcome.  

I'm using a Galaxy A751 5G.   Model name:  SM-A716V.  I've had this phone for almost 3 years, and this is the first major issue I've had.  My carrier is Xfinity Mobile