We cannot log into russellteam.com. We migrated using Snapshot, but I can't verify just yet what's the cause of the issue. The migration went off without a hitch. I could log in fine. As soon as we mapped the domain, login access ended. I'm seeing the following error on login page:
ERROR: Cookies are blocked or not supported by your browser. You must enable cookies to use WordPress.
Debug mode shows me no errors so far. I migrated to russellteam.dangeroustactics.com and I could log in fine. But as soon as I mapped the domain russellteam.com, all of a sudden I can't access the backend.
The original multisite where the site was located was demo.dangeroustactics.com. The one where it's been migrated is dangeroustactics.com. It worked great both before and after the migration. It's mapping the domain that seems to be what triggers the login issue.
Since the wordpress installs are both on the same box (we're consolidating everyone to a single WP multisite), all I did was move the site straight over and change the document root, so the domain would resolve at the right directory.
So far, I've tried disabling all plugins across the entire network. I've reverted to default theme. I've changed salts. I've checked wp-config and htaccess and don't see anything that jumps out at me. I'm kind of at a loss as to what I should check next. Any insight is much appreciated!