Why do I get an error code 90 when wifi calling?

[AC Question]

error code 90 WiFi calling

my phone on WiFi calling reads error code 90 cannot connect on my lgL70

 

[B. Diddy]

Re: error code 90 WiFi calling

Welcome to Android Central! Are you on T-Mobile? If so, looks like you're not alone: https://support.t-mobile.com/thread/76005. Try calling your carrier's support line.