Do Not Disturb not working

I got woken up by a few messages in a FB messenger group chat this morning. I'm not sure why I got the notifiation as my phone was set to do not disturb.

I got the usual notification 'pop' sound and the vibrate which both woke me up. My Do not Disturb was turned on, set to Priority Only until my alarm was due to go off (approx. 45 mins later). None of the contacts in my FB group chat are starred or 'Priority only', and FB Messenger App has the option 'Override Do No Disturb' turned off....

Do Not Disturb not working

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