How to enable Light Flow for text messages?

I've got a new LG G4 from Verizon and my Light Flow app works for charging, fully charged, calendar reminders, etc. Except that it doesn't work for text messages. I can test it and it will flash but it doesn't for actual messages.

I've looked at all of the settings both in the app and in Verizon Messages + and I can't find anything that is not checked like it should be.

Any ideas?

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How to enable Light Flow for text messages?