Had same issue while following that thread.
1st on the config of Part 4 steps 4 -> 10 there was code to paste with * instead of == , but this is easy to fix - check the screenshot.
2nd missing configuration of owa and ecp external connectors on the exchange side - need to set up exclusively to ADFS and disable rest of them: Step #7 of MSDN guide attached (author advises to return and continue after step #6).