I have the same issue, after updating MAC OS Monterey 12.1 outlook search is broken and not working, I have tried all options from youtube and other articles but no use.
I have contacted Apple support and they said it is an application error from the Microsoft application and they need to solve it, when I contacted the Microsoft support center they said it is from the Apple side as they have updated their OS and need to be fixed by Apple only.
I hope this will get sorted out soon.
DineshShukla
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