Hi @Irvanda ,
Welcome to our forum!
According to my research and test, this problem seems to be related to the settings of Google Calendar:
Open Google Calendar.
At the top right, click Settings.
On the left, under General, click Event settings and then go to Add invitations to my calendar.
Select When I respond to the invitation in email(Note: The setting will apply to new invitations.)
Send a new meeting invitation from Outlook after you complete the setup to see if the issue continues.
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