Do not know if that is anywhere documented. I am used to use passwords with 12 and more digits. During every SP install from nwconfig where login as admin was required I had the problem that I could never successfully authenticate and therefore had to redo schema extensions manually afterwards.

I this time changed password after several useless attempts of upgrading (to edir 8.8.2) to an only 6 digits short password and voila could authenticate without problem.

So I supect there is a password length limit in the script software used for patching, that does not allow passwords of 12 digits or more (maybe 10 is the maximum - but did not really test that).

Just for your information if you encounter the same problem.