samsung – How to check existing Android Exchange Domain settings

I am installing my wife’s new phone using Samsung Smart Switch.

It nicely installs all apps, including Outlook, however it does not copy the account settings for her Exchange mail.

I know her Outlook mail address, mail server name and password, but have not been able to find her domain setting in any documentation or in the settings of her old phone (domainusername).

Is there any we of discovering that domain setting on her OLD mobile ?? I have tried to find it, without any luck. And service desk of her work is unavailable during the weekend. Hence my question.

Many thanks,