No permitido jugar online Minecraft Windows 10 edition [Edit - Translation] - Not allowed...

You will need to post on the Minecraft forums or the Mojang support for better
assistance.

Can you show us a photo of the exact error message?

Are you really asked to purchase another edition, or is it an error message about privacy settings? Is it possible that you simply downloaded the free trial version of Minecraft instead of buying Minecraft for Windows 10?

If it's privacy settings, and you have a child account, you need the help of a parent with an adult account.
Have the adult go to https://account.microsoft.com/family and have them add your account to the Family.

As an adult you yourself go to https://account.xbox.com/settings (or have your parent go there, if you are a child).

There make the necessary privacy settings to be able to see creations from other users, and save the settings before moving to the "Xbox One/Windows 10" section. There allow your account to play online multiplayer with people outside of Xbox Live, and Multiplayer
in general.

[Google Translation:]

¿Puede mostrarnos una foto del mensaje de error exacto?

¿Realmente se le pide que compre otra edición, o es un mensaje de error sobre la configuración de privacidad? ¿Es posible que simplemente haya descargado la versión de prueba gratuita de Minecraft en lugar de comprar Minecraft para Windows 10?

Si se trata de configuraciones de privacidad y tiene una cuenta infantil, necesita la ayuda de un padre con una cuenta de adulto.

Haga que el adulto vaya a https://account.microsoft.com/family y haga que agreguen su cuenta a la familia.

Como adulto, usted mismo vaya a https://account.xbox.com/settings (o haga que sus padres vayan allí, si es un niño).

Realice la configuración de privacidad necesaria para poder ver creaciones de otros usuarios y guarde la configuración antes de pasar a la sección "Xbox One / Windows 10". Permite que su cuenta juegue en línea con jugadores múltiples con personas ajenas
a Xbox Live y en modo multijugador en general.

Estoy jugando desde un sistema windows 10, tampoco me permite jugar en multijugador.

[Edit Translation] - I'm playing from a windows 10 system, it doesn't allow me to play multiplayer either.

Komischerweise Es liegt nur an Minecraft Windows 10 Edition an anderen Spielen von Windows Store nicht.

[Mod Translation-Strangely enough, it is only due to Minecraft Windows 10 Edition on other games from Windows Store.]

Looked through some of the help articles - man the information is confusing.

Anyways from what I'm inferring from the posts is that you can play Windows 10 to Windows 10, and Pocket Edition to Windows 10 and that's it right now.

https://support.xbox.com/en-CA/games/game-titles/minecraft-help-on-different-devices

"You can play Minecraft: Windows 10 Edition Beta with other devices running Pocket Edition, such as Windows 10 and Windows Phone devices. Right now, you can play local multiplayer on Minecraft: Windows 10 Edition Beta. Soon after the launch, online
play will be available for Minecraft: Windows 10 Edition Beta."

http://support.xbox.com/en-CA/games/game-titles/minecraft-windows-10-edition-beta-faq#a5eebb2f431442ff850f552a209f44ed

Can I play online with other people on Windows 10? Or on different devices?

You can play with up to four other people running Minecraft: Windows 10 Edition Beta or Pocket Edition on your local network. You can also play online with up to four of your Xbox Live friends in online multiplayer gaming.