Hi @BenjaminStusghish ，
Welcome to Microsoft Q&A forum and posting your question here.
After accepting the meeting, the invitation email disappeared, and I found it in deleted folder.
According to my search, the reason for this situation is that default option in Outlook.
To cancel this option via File > Options > Mail > under Send messages
In addition, if you want to automatically move the meeting invitation emails to a specific folder, it is recommended you create a rule.
Here are the detailed steps for your reference:
- Home > Rules > Manage rules & Alerts > New Rule
- In the Start from a blank rule section, select Apply rule on messages I receive. Then click Next.
- Scroll down and select which is a meeting invitation or update, then click Next.
In the Step 1 section, select move it to the specified folder.
In the Step 2 section, click the underlined word specified and select the folder where you want these messages filed.
- In Next screen, if there are no exceptions, just click Next.
On the final screen, specify the rule.
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