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Sometimes I'm receiving this message below during the customer login after being changed the cookie domain through the admin panel.

Do you know why and when this message shows up?

Invalid Form Key. Please refresh the page

Magento2 Invalid Form Key. Please refresh the page

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Magento 2 - What is the use of formkey

If you receive the error message, in cases where the form_key should still be valid, it is in most cases an issue in the cookie setup. If Magento can not find the form_key from your cookie, the form_key validation will fail. Issues for this could be an invalid cookie-domain, cookie-lifetime, ...

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I solved it not just refreshing the caches invalidated but flushing all the caches possibles via admin panel through these 3 sections in the image below.

Do it mainly if you are using compiled configurations.

Magento 2 cache flush cookie domain issue

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