I downloaded the launcher for the first time yesterday (19/04) and any time I open it there is No Connection in the top left and Play Offline is the only option I have.
I have so far refreshed the connection using refresh button in launcher, restarted my launcher, restarted my PC, restarted my internet connection, checked my firewall to make sure it's not being blocked, changed the "launcher_profiles.json" config to "channel" : "release" and also "channel" : "beta", also have checked and unchecked the "Use beta version of the Launcher". None of these things have fixed my connection issue.
Using launcher version 2.1.13827 (beta) and game version 1.15.2 (java edition).
Please find attached a screen shot of my launcher with "No Connection" in the top left.