The following users reported being unable to vote in the 2015 board election despite being in both centralauth voter lists:
This was initially reported on T97924. The problem appears to be an error in the election configuration, combined with the "custom unqualified error" feature causing the descriptive error message to be discarded. The "max-registration" property was set on the election despite that being a local property, it is not aware of CentralAuth and reflects the date at which the user first logged in to metawiki.
The max-registration property has now been removed. Awaiting confirmation of the fix.