Sending MMS to android

Hi,

I have the iphone11pro. I am unable (as of today) to send MMS messages to android phones. I am also unable to receive MMS messages from them. Regular text works fine to and from all phones, and MMS works fine from my phone to another iphone. Anybody have any idea if a fix is in the works? We recently switched from the Sprint network is this the reason?

Thanks,

Lori