Hello Siqi Yang,
Thank you for your post in this Q&A forum.
I have done some tests, before accepting the invite, it shows none for everyone.
Once one attendee accepts the invite it shows accepted and for rest it shows none.
One of the attendees rejected the invite and it shows rejected.
since the organizer doesn't need to response to the invite so for organizer status shows none.
There might be a bug causing this issue from you end, I would strongly recommend you open a ticket with Microsoft.
Hope this helps.
Thanks
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