I just sent a message about not being able to send Inbox messages to Groups. I did it last week, but can't this week.
But then I got an Exception ID: 37FF74E2 error when I submitted the message. Is that a feature since I'm on the free version or a bug? Can I post to the Community from the free version...
Sorry that your question went so long without an answer! Using the inbox to message students in a group would not be affected by being on the free platform. Can you describe the steps that you were using to message the group?
Take a look at this guide for the process on messaging a group from the teacher perspective and let me know if it helps!