outlook 16.22.0 on macOS mojave
unable to open outlook 16.22.0 on macOS mojave
suspect bad attachment
iMac Pro
Welcome!
As MS Office is not an Apple product and there are not as many Office users active here as one would think, I believe you will be better served by asking in Microsoft's Office forums.
Results in Office - Microsoft Community
MS made their forums less user-friendly than before by making it harder to limit answers to Mac subjects, but it can be done when you know the trick:
Use the Sub-Topics pull-down to limit answers to Macs, and the Show Filters option to further narrow the results.
Everyone there is both and Office user and a Mac user, something you can't say about Apple's forums. I believe you will find the contributors there knowledgeable and very helpful.