@lfbrock I'm using a single mattermost server to host teams for two different companies. Since I am part of each of these companies, I have one account for each company, but with different email addresses.
I realize my particular use case might be rare. But getting back to the set up I had before (being able to be logged in two two different accounts simultaneously from the same desktop client) now seems to require me to install two separate instances of the mattermost server. I'd like to avoid doing something like that if possible since it doubles the work I need to do to maintain the server.
Like I said above, I have a workaround (use the desktop client for one account, a browser for the other), but I would like to return to the UX I had before the upgrade to 3.0 if possible.