MMS Not Sending Pixel 3XL

[fireidiot]

I've been on my Pixel 3XL for about a month now and when sending a MMS photo message, most times it will tell me Not Sent. And then I click it a second time and it sends, but it sends twice (sometimes 5 min apart, sometimes hours). I worked with Fi Support and they had me reset a bunch if settings and it seemed that it was fixed until today. Same issue......

Anyone else having this?

Oh BTW, I'm using Android Messages.