Connect to Shared mailbox o365 (cloud)

Hi Everybody,

We are trying to connect to a sharedmailbox that used to work with Power BI connector exchance.
Sinds some time now we can't acces the sharedmail box via Power BI. 

What happend:
1. Upgrade from Exchange 2010 naar Exchange 2016. But i don't this is the issue
2. Shared mailbox migrated to cloud ( )

Errors:
1.'Mailbox does not exist'
2. De versie van Exchange Server wordt niet ondersteund. Alleen Exchange Server 2007 SP1 of hoger wordt ondersteund.
Details.

I can connect to my own email, that hust works fine, its'just the shared mailbox.

Any tips will do.

Kind Regards,
Prashand