Minecraft Realm?

I would like to know if a Minecraft Realm for 2 people can be played with multiple accounts alternately.

I'll give you a rough example of what exactly I mean by that.

Me and my girlfriend want to play Minecraft together. That's why we want a realm for two. However, we want to play together with me on two consoles. Me on my Xbox Series X and she's next to me on my Xbox One. But if she is not with me, then unfortunately she only has her cell phone. That's why I would like to know whether only 2 people can be in the realm at the same time or whether you can also play alternately on the console or mobile phone. There are still a maximum of 2 players on the realm at the same time.

Hopefully someone can answer that for me… 😅

You don't need realms, this is the Bedrock version so if you have them as a friend in Xbox you can play normally without realms