Do a clean reinstallation of geforce experience on your computer. This post- https://droidtheory.com/fix-nvidia-geforce-experience-error-code-0x0001/ just to install the beta version and it worked for me, try out and let me know

Hi there i was getting the same issue in my iphone 11 over at&t network. I found the steps from here which suggested me to setup my voicemail over mobile data. And that worked for me, you can try out this fix. Hope it works for you thanks