Thank you for testing out the Priority Matrix and MS Teams integration, and sorry to see you are removing it 🙁 BTW, any feedback you can share about your experience would be very appreciated!
Remove Priority Matrix chat bot from MS Teams
1. Click in “…” of the channel where the chat bot is
2. Click in “Manage team”
3. Open tab “Apps”
4. Click the “trash” icon of the app that you want to remove ( Priority Matrix in this case )