My first guess is that your default mail program on the machine is wrong, either it has another version of outlook (like some PCs that come with office pre-installed) or it's trying to use the "mail" app. Can you confirm the default program is set to the correct outlook?

Under Default Apps in settings.

Found issue disregard previous request

Thanks
John

John -
Can you let us know what you found that lead to your solution?
It may help others in the future.