iPhone 8 plus with iOS 15.1 WiFi toggle greyed out and will not work. No WiFi after update iOS 15.1! When will this be fixed?

Hi iPhone8plus11-3-21,

Welcome to Apple Support Communities. We understand that you're having an issue with the Wi-Fi on your iPhone 8 Plus. We'd like to help.

These steps should be able to help you with this specific issue. Make sure you complete the steps to Reset your Network Settings:

If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network

If you continue to have issues after that, you may want to have your iPhone evaluated to make sure this isn't a hardware issue. You can Find Locations near you that can help.

If you have additional questions, Contact Apple Support as they will be look into this issue with you further.

Hope that helps.

Take care!