Messaging gives error notice “MMS messaging must be enabled to send this message” yet I have MMS enabled!

LGH in FL wrote:

Messaging gives error notice “MMS messaging must be enabled to send this message” yet I have MMS enabled! I deleted an eSim upon returning from Italy because I thought that was the problem. Still not working . Help!?!

You contact your cellular data provider for help, MMS is their feature.