Trouble getting voicemail

I have setup a contact that dials my voicemail. The number I use has pauses so it dials the voicemail number, pauses and enters the voicemail account number, pauses again then dials a passcode.

That worked fine on my iPhone SE but now, I have a iPhone 13. With the iPhone 13, the voicemail isn't getting the numbers correctly. It keeps responding that the information is incorrect.

I've verified the numbers many many times and tried many different placements of pauses to no avail.

Does anyone have an idea of what might be happening?

Steve