Who I have the same questioned this topic

I have been with Verizon almost a year now; I decided to recently change to a new phone number (staying with Verizon / same phone - iphone 11) - now several issues with voicemail...
1) no one can leave me a voicemail on my new number (same old phone) without entering in my old phone number (old phone number no longer works)
2) every time I call my voicemail on the new number, I get asked to enter the old number "mailbox number"