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Access on-prem Exchange mailbox with AAD Joined device

We have setup Exchange 2016 Hybrid latest CU etc.
Moved my mailbox to O365 and all works well, free busy, autodiscover etc.

Now i have a test Windows 10 device joined to Azure AD (not hybrid).
Accessing my mailbox via Outlook is SSO but i also have a shared mailbox to open that is on-premises and this one causes a authentication prompt. 

Is the authentication prompt for the on-premises mailbox expected behaviour or can we achieve SSO ?