Authenticate Subdomain

Ensure that COOKIEHASH has the same value for both, e.g.: define( ‘COOKIEHASH’, md5( ‘https://yourdomain.com’ ) ); define( ‘COOKIE_DOMAIN’, ‘.yourdomain.com’ ); See https://wordpress.stackexchange.com/a/264490/736

Getting Authentication required popup

Found the answer for this issue. This appears to be happening to users that are using Chrome and/or WebHostingPad websites. Google released an update that essentially broke the popup by no longer displaying the information needed to get past the popup. Open the page in another browser, I’ve used IE, then the login information required … Read more