It seems as though Microsoft has pulled the support for Mojang accounts and in order to play on online servers now, you must migrate your account to a Microsoft account as the legacy api's used for session management within the game no longer are working. We're currently seeing multiple issues being raised where people can no longer login to online servers anymore with their non migrated Mojang account. Mojang Accounts Cannot Play Online Anymore

Also feel free to reach out in the #translations channel in our Discord. If you're fluent in English and another language and want to contribute to the translation of the launcher, please visit our CrowdIn page and help translate. Lastly we've been gearing up the launcher to work with multi languages, and while we're not there just yet, we're close and the last step to get going is to get the translations all up to date and done so the UI can be worked on to accommodate the different languages. We've tested this out a bunch and it should be okay, but if you have an ARM device and notice issues, please reach out in our Discord to help us refine and fix issues going forward as we now fully support ARM devices. Previously ATLauncher didn't work too well with ARM devices, and with this update we've included support for running Minecraft on ARM devices.

We've just released version 3.4.20.0 of the launcher which includes beta support for ARM based devices as well as preparations for translations and multilanguage support.

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