"new improved" launcher doesn't work at all

New launcher installed but crash when we choose "Windows account" (pictures 2 + 3)
[https://aka.ms/DownloadNewLauncher?ref=launcher
]
Account is migrated from Mojang
(java launcher is working fine but don't reconize my "Minecraft Dungeons" is not on the "old" launcher...)

Since I installed the "new improved" launcher, mc dungeons doesn't connect to my "windows account"...