Missing mailbox on MacBook Air Ventura 13.2.1

On Mail on my heavily used MacBook Air I am missing a mailbox that I set up and have placed emails in. The missing mailbox is accessible directly from iCloud, from an older desktop (running Catalina 15.7) and from my iPhone (IOS 16.3). All other mailboxes that I set up myself show up on all my devices. Why is it this one mailbox doesn't show up on the MacBook Air? Is it a software glitch or is something off about the way I set the mailbox up? Any thoughts? Thanks for the help!