Group message not received on iPhone but works on Apple Watch

In the messaging app, there is one established group that I am not receiving messages from. Interestingly, I can message the group from my phone but I do not receive responses. However, I do receive responses from this group on my watch. All other group messaging works well and I am able to message the group participants separately. Any help in restoring the receipt of messages from this group on my iPhone would be greatly appreciated! Thank you!

[Re-Titled by Moderator]