Unable to interact with recent versions of Outlook (Microsoft 365)

[jason1365]

No longer syncing (cannot "delete all synced items" either) with: Microsoft® Outlook® for Microsoft 365 MSO (Version 2502 Build 16.0.18526.20546) 64-bit

Error Syncing:
System.InvalidCastException: Unable to cast COM object of type 'Microsoft.Office.Interop.Outlook.ApplicationClass' to interface type 'Microsoft.Office.Interop.Outlook._Application'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{00063001-0000-0000-C000-000000000046}' failed due to the following error: Interface not registered (Exception from HRESULT: 0x80040155).
   at System.StubHelpers.StubHelpers.GetCOMIPFromRCW(Object objSrc, IntPtr pCPCMD, IntPtr& ppTarget, Boolean& pfNeedsRelease)
   at Microsoft.Office.Interop.Outlook.ApplicationClass.GetNamespace(String Type)
   at OutlookCalendarSync.OutlookHelper.<>c__DisplayClass1_0.<GetFolder>b__0()
   at OutlookCalendarSync.OutlookHelper.RetryInteropAction(Func`1 action)
   at OutlookCalendarSync.OutlookHelper.GetFolder(OutlookCalendar calendar)
   at OutlookCalendarSync.OutlookCalendar.GetAppointmentItemsInRange(DateTime syncDateTime)
   at OutlookCalendarSync.MainForm.SyncWorker_DoWork(Object sender, DoWorkEventArgs e)