I have been back and forth with Verizon and with Textra about this and unfortunately it looks like (at least in my case) it is Android that is causing the issue.

Pulse SMS and Google Straight are two alternative customizable apps that both offer the added benefit of bringing all of your messages across devices.On current version I do not see Legacy or System options in Settings. While the latest version has improved battery use, it can still drain your power if you leave it open along with other apps. If you’ve had enough of talking to anyone, you can add their number to a blacklist. There are quick reply pop-ups, and it's easy to access your mobile messages when crafting new texts. Textra also works well for creating group chats to stay in touch with your friends, family, and work team. You can choose from over 2000+ emojis, voice messages, and GIFS to add some entertainment to your conversations. You can schedule messages, make calls, delete texts, or send a reply all with the slide of your finger. All of the Textra’s features come together to create a seamless and enjoyable user experience. If you need to adjust the font size for easy reading. You can also switch between dark, light, and auto-night mode. With this SMS & MMS app, you can customize your preferred theme by changing bubble colors, signatures, and notifications.

It provides a customizable interface, blacklisting, and a keyboard full of GIFS and Emojis. Textra SMS is a free program that can replace your standard SMS/MMS application on your Android device.

Textra desktop