This function will return the name associated with the current user.
If you just want the current user ID, use curUserId()
XUserInfo::find(false, curUserId()).name;
D365FFO / AX – Get Current User Name – X++
This function will return the name associated with the current user.
If you just want the current user ID, use curUserId()
XUserInfo::find(false, curUserId()).name;
AX / Dynamics 365 For Finance and Operations blog 