Problem caused by using 2 Microsoft accounts

Hi and thanks for reaching Microsoft Xbox gamer's community. My name is Josef.
I'm an Independent Advisor and a Microsoft Xbox user like you.

Hope you're doing great today Luken

Is your mojang account already migrated?
If not, actually you can merge the data with your Microsoft account doing the migration process to that account

If not, sadly is not possible

Yes, I have confirmed that information.

The version is already the latest version I can update

I think I am signed in with a personal Microsoft Account (MSA).

I use my company account to log in to hololens 2 and download mesh app with mt personal account by gmail.

I don't know why I can't use gmail account log in to hololens 2.

I'm not sure if this will cause a problem.

I think the problem caused by the same external IP address.

We are playing Minecraft Dungeon on 2 different laptops with our own XBOX accounts, but one source of internet.

Whenever we play the game, this will pop out, HOWEVER, if one of us uses VPN, no problems occurred.

This is something Microsoft/Mojang should check and update on the next patch.

Hi Chiara, I hope you are well.

Please try these steps.

The problem of losing Marketplace purchases and worlds in Minecraft Bedrock can be caused by several factors, such as login errors, game updates, or issues with your Microsoft account. To try to resolve this, follow these steps:

1. Check your Microsoft account:

Make sure you are logged into the correct Microsoft account that was used to make the Marketplace purchases. Sometimes the problem can be caused by being logged into a different account.

2. Update the game:

Make sure Minecraft is updated to the latest version.

3. Uninstall and reinstall the Minecraft Launcher:

Try uninstalling and reinstalling the Minecraft Launcher. This may help fix software issues.

4. Check your Microsoft purchase history:

Access your Microsoft account purchase history to verify that your purchases were completed correctly. If you experience issues, contact Microsoft support to request a refund or get help restoring your purchases

Shouldn't cause a problem.
I'd recommend reading over this page, as it can have some impact. The biggest impact would be if your mother has any Microsoft Account services, like O365, tied to that Microsoft Account as well.