Group message "service not activated on network"

I have a Nexus 6P and recently my phone won't allow me to send messages in a group text anymore. I'm on AT&T network. I've never had an issue before and all of a sudden it won't let me send group texts. I have my APN setting on NextGenPhone but still nothing. Any ideas?

I have a Nexus 6P and recently my phone won't allow me to send messages in a group text anymore. I'm on AT&T network. I've never had an issue before and all of a sudden it won't let me send group texts. I have my APN setting on NextGenPhone but still nothing. Any ideas?

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