I was forced to login to Meta Stack Exchange to be able to login to Area51. Is this expected?
We changed the way Area51 login works a few months ago to route through meta.stackexchange.com as part of several steps to unify our login system
A few months ago would have been October 2018 or so but I can't find the actual date or announcement on that. Maybe Nick or Adam can edit that in if they stumble on this answer.