How to fix Google Chrome error - "Your browser's cookie functionality is turned off. Please turn it on".
Specially when you are sure that the settings to allow cookies is enabled, don't panic, if you have adblocker go inside it's settings and remove Gmail from blocked cookies, and pause it for gmail and other google services that gives this error, if you have a privacy protection software add google and it's services like gmail to the allowed list "Exceptions" and after that clear all cookies and restart your browser.
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I hope it was helpful.