Outbound porting issue, resulting in no text/SMS service on new carrier

Hi,

I purchased a new phone yesterday with another Verizon MVNO.

I ported my number to them from Xfinity but texting/SMS is not working. 

After researching online, this seems to be a recurring problem with porting. 

It will show as completed in the Xfinity system but actually a manual push is needed.

Please can someone help?