ConcatenateMultivaluedString Function - microsoft/MIMWAL GitHub Wiki
string ConcatenateMultivaluedString(values:List<string>, delimiter:string)
Concatenates the values in a multi-valued string.
The first input parameter can be a list of strings or a single string. If the second input parameter (delimiter) is null, an exception is thrown.
1.0.0.0 and later
ConcatenateMultivaluedString([//Target/ExplicitMember/Email],";")