Apple Mail: 'All Inboxes' disappeared, and when I added it again, it contained no messages
I accidentally deleted 'All Inboxes' from the left 'column' navigation in Apple Mail. I added it again using the '+' sign, but now it is empty. Previously, it included all inboxes from all of my email addresses, from newest down to oldest. How do I get email content in 'My Inboxes' again?
MacBook Air 13″, macOS 12.1