Hi, I have encountered the same problem. (New Outlook (latest update), MacOS 11.6, latest Alfred update).
I've followed all the mentioned steps above, but nothing seems to solve this issue.
No snippet problems elsewhere by the way.
I've updated Outlook last week, maybe the issue was created then.
Update 10-12-2021: Issue seems to be resolved. No idea what I've done. So far no new updates we available.