Is there a way to get the Lollipop software to allow me to send MMS while on a microcell?

[Gweebles]

Since my ATT phone updated to Lollipop, I cannot send MMS messages while on a microcell or range extender. I tried to flash back to Kitkat but it wouldn't do grade. Anyone know if there is a fix on this? AT&T is stumped too.