The “Invalid or missing CSRF token” message means that your browser couldn’t create a secure cookie, or couldn’t access that cookie to authorize your login. This can be caused by various conditions, but also by the browser itself.
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Release: ACNUNL99000-2.0-Agile Central-Unlimited Edition-Perpetual
In most scenarios the error can be cleared by refreshing the page in the browser, reentering the setting update and saving again.