我最近遇到了一个相同的问题，只是想出了解决方案. 看来Microsoft已更新了他们对Ical电子邮件的评估方式.

I ran into a same issue recently and just figured out the solution. Looks like Microsoft has updated how they valuate Ical emails.

因此损坏的不是ICS文件，但是如果要发送取消消息，则可能会有一些标有method = REQUEST的标头.这适用于所有平台，但看起来Microsoft正在检查取消电子邮件是否为method = CANCEL.

So it's not the ICS file that's corrupted, but if you're sending out a cancellation, you'll probably have some header that may say method=REQUEST. This works on all platforms but looks like Microsoft is checking if this is method=CANCEL for cancellation emails.

如果您的标题为method = REQUEST，并且ICS文件旨在取消会议，则该会议将被破坏.您必须将其更改为method = CANCEL.

If you have a header of method=REQUEST and your ICS file is meant to cancel a meeting, it will then be corrupt. You'll have to change it to method=CANCEL.

希望有帮助！