trying to play on my minecraft realm

Have you checked your in-game settings within Minecraft? There is a setting in the menu which needs to be clicked to access any online play so I would first check your in-game settings and then contact Microsoft or Mojang if everything seems to be set
correctly and it's still not connecting. It could also be a problem on Mojang/Minecraft's end, but they should be able to let you know if it is and how long until they expect it to be working.

Sorry to hear it. Please check out Mojang's support page for more assistance https://help.mojang.com/customer/portal/articles/1018151-minecraft-realms

Thanks for answering. I use minecraft windows 10 edition. When i click play to my own realm it says : Connection to the realm. This operation can takes few minutes. After a few it says: Cant acces to your Realm. please try later. (since 2 days we cant acces
to the realm)

I have 26 days left to my realm subsription.

I also tried to dowload my realm to normal mode and i can play with it.

Only on Realm mode we cant play

Hi DianeMcAdams! My name is Ricardo an independent advisor ready to help you with this situation!

Minecraft Realms and Realms Plus are subscription-based services that let you play Minecraft online with friends and family on your own personal server and, depending on the service, give you access to a catalog of Minecraft content, including skins, worlds, and resource packs. You can subscribe to Minecraft Realms or Realms Plus with the latest Bedrock Engine-based version of Minecraft found on mobile, VR devices, Nintendo Switch consoles, Xbox consoles, and Windows 10 computers.

If you play Minecraft on a PC (using the Java Edition), a separate Minecraft Realms subscription service is available. To learn more or to manage your subscription, visit the Minecraft Realms FAQ on the Minecraft website.

https://minecraft.net/realms/faq/

The cross play of Minecraft works as such,

The PC/MAC is separate from the other versions in terms of cross-play. As in the only way to join a game with console or mobile players (or Windows 10) is to play on a realm.

Console (Xbox and PS), Mobile and Windows 10 will all work without needing realms as long as your friends are online or on the same network as yourself.

It is only the PC/MAC version of the game that will require you to use realms to join each others game.

But his friends are on Xbox One edition and my son has the newest minecraft. Apparently they can't play together because they're on different versions?? That's what I'm trying to determine. They're not trying to join realms.