Check the phone dialer application to see if the visual voicemail function moved there like it is on the Pixel phones. You will likely need to remove the visual voicemail feature from your line in order to get the notifications for the basic non-visual voicemail offered by Verizon Wireless or the visual voicemail function by Google.
I'm most definitely NOT a VZW employee. If a post answered your question, please mark it as the answer.
