Hi @宇臻 郝 ,
When I received a Teams meeting invitation in my outlook, I clicked "accept" then the invitation e-mail disappeared.
As has been mentioned by mbuholzer, please have a look at your calendar to see if the meeting can be seen and joined there.
Besides, normally an accepted meeting invitation mail would be automatically moved the the Deleted items folder, so you can have a check over there as well.
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