I was unable to merge accounts while logging in through https
HTTPS on Wikimedia projects is down at the moment. Some quotes from #wikimedia-tech:
<RoanKattouw> Someone deployed a new nginx configuration, and that caused all nginx servers (including the ones that serve as HTTPS proxies) so restart at the same time
<Danny_B|backup> any eta for https up?
<Reedy> few minutes
<RoanKattouw> OK, things should be coming back up now
<RoanKattouw> According to nagios, the following are back up
<RoanKattouw> For Europe: bits, upload, wikipedia, wikibooks, wikimediafoundation
<RoanKattouw> For the US: bits only
<RoanKattouw> When I say "the US" I really mean "the entire world except Europe"