Zenfone 8 Calls Not Functioning

[demigirldemigod]

I'm on AT&T. This month, my calls stopped working. If anyone tries to call me, it acts like the line is busy. If I try to call someone, it immediately hangs up.
Two on call with support with AT&T, a text chat with an ASUS support staff, nothing useful.
My friend 2 towns over is having the same issue with their Zen 8.
I have the 16/256 model from Playfone on Newegg
VoLTE and everything is enable, I have Data and Text.
IDK why I'm not seeing more people with this issue online. It's clearly not just me.
They are trying to get me to trade in, but I don't want to. This phone is perfect for me, and I want to do everything I can to keep it.

[cross1307]

Yes, you're not the only one. My carrier is AT&T. Both Zenfone I have, Zenfone 8 and Zenfone 5Q can't make any call neither receive phone call today!
Is there any solution we can work around it?

[cross1307]

[Update] With further research, I solved the issue by turning on VoLTE on Zenfone 8. For Zenfone 5Q however, the feature of turning on VoLTE is blocked by AT&T. For some reason, AT&T decided to block the older (3 yrs old) phones, even though it's still working well.