Error: Syncfusion.XlsIO.Implementation.Exceptions.ParseException: XLOOKUP isn't custom function. at position 1. Formula: XLOOKUP(OverzichtJumbo!$A2;FirstTab!$A:$A;FirstTab!$B:$B;na;0;1), Position: 8
worksheetOverzicht.Range[$"C{count}"].Formula= $"=XLOOKUP(OverzichtJumbo!$A{count};FirstTab!$A:$A;FirstTab!$B:$B;na;0;1)";