Error in sending money through apple pay due to apple id

I have tried to send my rent money to my landlord as I do every month and now I am getting a message stating Apple cash requires the same Apple ID for iMessage and iCloud. To send and receive money on this device, sign in to iMessage with my email address. I just switched over to another phone company and my old number is no longer in use and I have erased it out of this phone and I am only using the one phone number now which has been updated. I hit the button at the bottom of that message that says open settings and I have changed everything that I could and nothing is working. What do I do?????