error connecting to exchange/ o365

[SimonNicholson]

Hello i am having a real issue trying to connect to outlook calendars in O365.

i am owner on all the outlook calendars and get the following message for some (not all) O365 accounts.

thanks!

DataSource.Error: ErrorItemNotFound: The specified object was not found in the store., The process failed to get the correct properties. Details: DataSourceKind=Exchange DataSourcePath=email@xyz.co.uk Details=

[v-yuezhe-msft]

@SimonNicholson，

Please check if there are any security and accessibility problems on Exchange side, there is a similar thread for your reference.

Also do you connect to shared mailbox? If so, please make sure that it is not a on-premise mailbox, but a O365 online mailbox.

Regards,
Lydia

[SimonNicholson]

thanks

what specifically needs to be set in Exchange? i am a calendar owner for all on O365 online. these are individuals calendars rather than shared