Experiencing the same problem.  My message says: "RepresentativeID" element is invalid.  Invalid according to its datatype 'Token" - the Pattern constraint failed.

I spoke with Intuit support -- they recommended re-entering my Efile code and password -- which didn't do anything.  They then said my EFILE code wasn't long enough, that it should be 7 characters... which I don't believe is correct.  I have the confirmation email from CRA showing that no changes have occured.

I spoke with the EFILE help desk too.  They suspected it had something to do with a RepID being needed to EFILE... but that doesn't really make sense either, because I have already done that.