Hi HorNet505,
I can reproduce this issue when testing in my Outlook 2016. According to the official article below, "Microsoft has confirmed that this is a problem". (Outlook 2016 is not mentioned in the "Applies to" section, but based on my test,
it seems it is the same case in Outlook 2016.)
Outlook does not import meeting attendees from certain file types
As a workaround, currently you may consider exporting calendar to PST files instead.
Hope the above information can be helpful.
Regards,
Yuki Sun
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