If CRA spots inconsistencies between the calendar entries and the meeting invites/requests/acceptances in the inbox/sent items, it sends out new invites to the recipients.
Here you can view more details about the Calendar Repair Assistant, the default value for O365 is enabled:
https://learn.microsoft.com/en-us/powershell/module/exchange/set-mailbox?view=exchange-ps#-calendarrepairdisabledYou can use PowerShell (PS) to create a remote session to Office 365 tenant then execute the following commands to disable CalendarRepairAssistant:
Get-Mailbox -ResultSize unlimited | Set-Mailbox -CalendarRepairDisabled $true
This will disable the Calendar Assistant for all mailboxes in the Office 365 tenant.
It can be enabled again by using this PS command:
Get-Mailbox -ResultSize unlimited | Set-Mailbox -CalendarRepairDisabled $false
You can also do this for a single mailbox:
Set-Mailbox -Identity <mailbox> -CalendarRepairDisabled $false.