Ensure your app is up to date as the following steps apply to the most recent version.
The My Verizon app is only available for Android® devices running 4.0 or higher and Apple® iOS devices running 10.0 or higher. For all other devices, visit verizonwireless.com to sign in and manage your account.
Only Account Managers and Account Owners can opt in; here's additional info on account roles.
Get Apple Music free for six months with Verizon Unlimited then $9.99 after.