RCS chat in Samsung Messages app disappeared after switching to Visible SIM in Galaxy S10 phone


I recently encouraged a friend to switch from Straight Talk to Visible.  When he activated his Visible service and switched his Straight Talk SIM with his new Visible SIM, everything went smoothly.  The only issue he has after the switch is that the Samsung Messages app that he is using for texting is no longer supporting RCS chat... just SMS.

In the settings for the Messages app there is no longer an Advanced section where you would normally turn RCS on or off.
If anyone has any idea how to restore RCS to the Samsung Messages app (that had it before he switched SIMS) I'd love to hear your thoughts.
PS: I suggested that he switch from the Samsung Messages app to the Google Messages app, but he doesn't want to do that.