After updating to iOS 12.2 the message app on my iPhone 8 will not send iMessages (blue). Instead, I can only send as text (green). I have hard restarted my device, turned iMessage on/off and turned off "send as SMS if iMessage is unavailable." None of those have fixed the problem. I am on AT&T, have all 4 bars on LTE and/or WiFi. Is anyone else having this issue and/or know of a fix?