What phone do you have? I just bought a 2014 Mazda 3 and have an iPhone 6s Plus and mine was grayed out too. Turns out in the bluetooth settings, there's a notification icon that was switched off. I turned that on and text messages started coming through.I have mazda 3 2016 v55. Text messages are on , but grayed out, they won't come thru.
I have mazda cx 5 and they do. Any suggestions?