I am a member of a number of Stack Exchange sites. Recently I seem to have gotten logged out from a number of them (Server Fault, Super User) and I can't figure out a way to log in without scrounging in my password manager and copy/pasting e.g. my Stack Overflow password into them.
I thought this used to be a lot easier — for example I found a 2010-era QA related to single sign-on tagged as status-completed. I also found a post from 2015 titled Global auth is dead! Long live universal login that includes these points:
When you log into any Q&A site on the stackexchange.com domain, you will be automatically logged into all other Q&A sites on the stackexchange.com domain + stackexchange.com itself.
Area 51 is excluded from this. stackoverflow.com, superuser.com, and other Q&A sites with their own domains will still use the old flow.
But is there now (in January 2019) no longer a way to just be signed in everywhere? Or am I just noticing this because of item number 2 in the quoted text — if so, what exactly is "the old flow"? What's the easiest way to keep logged into everything Stack Exchange [without staying logged into Google or Facebook shudder].