Shedding some more light on this. The network site I created which was giving me the “ERROR: Cookies are blocked…” was created manually as a New Site in the dashboard by super admin. I couldn’t get past the error so I deleted the network site and started over but this time, I created a new network site through the front-end by clicking on a PLAN and going through the setup on the front-end. After doing this, I was able to successfully login to the dashboard of the network site and no more cookies are blocked error.
Maybe this can shed some light for devs to see why super admin can’t manually add new site through back end.
I’m having the same issue. “ERROR: Cookies are blocked or not supported by your browser. You must enable cookies to use WordPress.”
Did this get resolved? Please help. I can access my main site fine but cannot access network sites no matter which browser I use in incognito mode. The mapped domain has correct IP address assigned. I don’t know if this has anything to do with it but I get SSL warning for the mapped domain. Running the mapped domain through SSL checker reveals a “common name mismatch”. I doubt this has anything to do with the login issue but that is another problem I am having.