Using Classic Outlook on Windows for personal email, calendar, and contact management
To get the fix you need to be on build 15128.36125 and higher. Since you are on MEC channel see if you can update to Version 2208 or higher. This page shows what builds and versions are at each channel, Update history for Microsoft 365 Apps (listed by date) - Office release notes | Microsoft Learn. MEC is at Version 2208 and higher. Try manually updating by clicking File, Office Account, Update Options, Update Now.
This error is still occuring on Microsoft® Outlook® for Microsoft 365 MSO (Version 2209 Build 16.0.15629.20256)