@Erneland
Hi,
You can wrap each cell with the TEXT function using the specific currency format that you want as follows:
=TEXTJOIN(" + ",TRUE,TEXT(A1,"[$kr-smj-NO] #,##0"),TEXT(A2,"[$kr-smj-NO] #,##0"))
Or you can use this one instead to wrap the range of cells in one TEXT function:
=TEXTJOIN(" + ",TRUE,INDEX(TEXT(A1:A2,"[$kr-smj-NO] #,##0"),))
Hope that helps