Who I have the same questioned this topic

i got a new phone today, and we got the plan that allows Apple Music with the plan. So I’ve been trying to set it up, and every time I try it says “No subscription through Verizon”. I have tried setting it up through the website, but my grandmother phone is the only device listed under our lines and it says her phone isn’t compatible with the plan we signed up for today. She has been with Verizon for quite sometime now, but she added me to her plan today, and switched to the Beyond Unlimited plan (the one with free Apple Music for the entirety of the plan and a hotspot, and unlimited data). What should I do to solve this problem?