Note: This exclusion only needs to be done on the server where you have SureFeedback installed (your dashboard site). You don’t need to add these cache exclusions on your connected sites!
If you host your site on WP Engine, you may encounter some issues without cache exclusions being added. This is due to aggressive page caching (which is a good thing!), but it can be easily resolved by requesting that WP Engine setup a special cache exception.
To do this, simply submit a support ticket to WP Engine via their support portal and ask them to exclude a few url query variables from cache.
To make things really easy for you, feel free to copy and paste this sample ticket:
My site runs the SureFeedback feedback plugin and we need to bypass varnish caching for their cookie. The SureFeedback team has instructed us to ask you to place a cache exception for their cookie.
Could you please bypass varnish caching for the _wp_session cookie?