Old launcher works and connects to minecraft services and can run java minecraft. new launcher doesn't. This is going on for a while now.
As a temporary fix, for those on windows 10, download and install the windows 7, 8 version of the launcher and use that until windows 10 launcher is fixed. This fixed it for me. Perhaps to also fix it, they should re-identify their current windows 10 launcher as beta test and to roll back to completely working one.
i made a "duplicate ticket" apparently, so they added me to this one as well. Minecraft was working for me yesterday, but now I can only play the demo. No idea why, no solution given.
I can't find a reference to me owning minecraft in the new site, though I absolutely do and the old launcher seems to know this. Could it be a problem related to the migration from mojang to microsoft?