There are following below cases where you are getting this error “Invalid Form Key. Please refresh the page”
- When customer creating new Account
- When customer Login in existing account
- When customer trying to Change / Forget Password
- When customer adding product in Cart
- When Store Login Login Admin side
- When creating a configurable product with multiple attributes
- When customer trying to add product to wishlist
- Even with a fresh Magento 2 installation
- After upgrading Magento 2 version
- Installing a new Magento 2 theme/module
Solution:: Need to increase the value of PHP Max_input_vars to the value in php.ini (PHP Configuration File)
The recommended value for Max_input_vars for Magento 2 should be 100000
After that restart Web Server (Apache / Nginx) to apply changes.
Finally issue will be resolved.