as an update - I still havent maanged to get it to work, although a bit more info to see if anyone can shed more light:
1 - AX is a new build, but the company data and settings are imported from the VPC from MS.
2 - My account on the domain is linked to Emil (employee 3300) from the default VPC data.
3 - Logging in to enter hours for a project, the employee id is filled in and I cna add hous to a project
4 - when opening the spreadsheet, Emil is automatically selected as the user, but the project drop down is still empty...