Different ringtones for primary and secondary phone numbers

I just created my business using the secondary phone number as a contact and assigned it a different ringtone than my primary number. I had a friend call me on the secondary number and it rang with the primary ringtone. I really thought this would work. Has anyone found a way to assign a separate ringtone to the second phone number on a dual sim iPhone 12? I know there is a small S when the secondary phone rings but my eyes aren't that great anymore. Ringtone would be so much better.