Multiple inboxes not displaying on "Unified Folders" - showing on "All Folders"

I have just set up Thunderbird with a handful of email accounts. All inboxes show in the "All Folders" panel block, but when "Unified Folders" block is selected, the accounts prefixed "Intuition" fail to show in the panel. The Unified Inbox DOES receive mail from these hidden accounts, but this isn't really good enough as I need to be able to browse in to the folders within these accounts regularly. Having both Unified and All views up is a workaround, but with 10+ accounts it takes up the full length of the screen when collapsed and is not the ideal setup. I have deleted the folder index json and a couple of other internet-sourced tricks but to no avail. Image attached - accounts prefixed "intuition" are the culprits!