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Awesome plugin. Does so much for a free plugin.
Had this issue repeatedly coming up for the FB login.
“Facebook SDK returned an error: Cross-site request forgery validation failed. Required param “state” missing”
The support team was quick to creating an replica FB app at their end with my URL details to check the issue.
Turned out it needed the exclusion of the cookie named PHPSESSID to make it work with varnish frontend.
Overall a comprehensive solution.