pt_PT this is not available as a language for the standard option set.

However, in F&O it shows the language pt-PT existing as normal.

pt-PT is not on the standard option set, it needs to be created from your end through a customization of the option set on CE, and when I have the new number, that have to customize the transformation on dual-write table map "Party (msdyn_parties)" for the field "Language" adding a value mapping for "pt-PT" and the number assigned on CE "1923500xx"

We need to add pt-PT to the standard option set in DW