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My Outlook is automatically duplicating calendar invites and not sending to attendees. One looks like it completely send, but obviously no one responds because they didn't receive. The other has no attendees listed and displays this message. 
Happens every time I send an invite.
Hi,
This question about outlook, I added office-outlook-itpro to this tag.
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Hi @K_Hege90 ,
What type of account are you using? Is it an IMAP or Exchange account?
Do you have sync and access your mailbox and/or calendar on multiple mobile devices? If so, you should start with disabling all the syncs that have been set up, create a new meeting item and see if the issue continues.
If you are running antivirus software, it is recommended that you turn it off temporarily, and if you do not create duplicates after sending the invitation, you will need to uninstall or close it while sending the invitation.
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Hi @K_Hege90 ,
It has been a while and I am writing to see how things are going on with this issue. Have you had a chance to check the replies provided? Any update would be appreciated
No, this has not worked. I now have to exit Outlook and do all calendar stuff in Gmail. It happens even if I accept a meeting time change from someone else. It just never sends to the respondent. It only happens with one of my addresses, not the others.
Hi @K_Hege90 ,
From your description, the issue only happens with one of your addresses, it is recommended you create a new profile to see if it continues:
Go to Control Panel > Mail > Show Profiles > Add, then reconnect your account.
If above doesn't help, repair office from control panel.
Hi @K_Hege90 ,*
Is there have any update from you? If yes, please feel free to let us know.