VERIFIED SOLUTION i
In MapInfo Pro 12.5 and 15.0 you only get the Legend and in MapInfo Pro 15.2 you only get the Scale Bar when trying to print both to PDF.
The has been reported as a bug in MapInfo Pro.
ResolutionUPDATED: August 6, 2019
A bug as been raised under the bug number MIPRO-73728. This will be looked at for the MapInfo PRo 15.0.1 update patch.