Email from NAV2016 with Azure AD

Hi all,

we want to send email from NAV2016. We are getting an error when sending the mail. We are using Azure Active directory.
We are running NAV2016 9.0.42815.

The last workstations which are not in Azure AD wont get this error and working fine.

Could anyone tell me what to do?

update: standalone pc does work (login O365) azure ad joined machine doenst work and gets error as attached - also login with O365)

regards