Hello KAITLYN BRADLEY,
Good day!
Thank you for posting to Microsoft Community. We are happy to help you.
Before we proceed, I would require more information to assist you better.
- What is the type of account? Is it a POP, IMAP, Exchange ActiveSync or Exchange account?
2. Please may i know your outlook version? What version of Outlook do I have? (microsoft.com)
3.Please may i know if your environment is hybrid? You can either as your IT department or if you know your Global Admin (Am asking that because if the Office is installed on a server and everyone in the company connects to that server, that kind issue can happen.)
4.Please use your outlook on the web to create new event in Calendar to see if you didn't notice any error
The problem seems specific to the 'invite attendees' function Am i right?
Please the information above is very important to find out the cause of your issue and provide you the right troubleshooting
Please get back to us with necessary information, we’ll be glad to assist you further.
Appreciate your patience and understanding and thank you for your time and cooperation.
Sincerely,
Eben Ezer Tres | Microsoft Community Moderator