I'm getting an error when trying to sign in to the Xbox Insider Hub App (Windows 10)

Get the Xbox Insider Hub app for Windows 10, and then under Insider Content there should be a Minecraft option.

Also this error code when trying to sign into XBL within Xbox Insider Hub: 0x80004003

Hi I'm Peter an independent advisor, glad to hear you want to try out the insider hub. Anyone can register, you need to install the xbox insider hub first of all on either the PC or Xbox One:

Xbox One

Move over to the Store tab on the dashboard or select Store in the guide.

Choose Search.

Enter insider in the box, then select Xbox Insider Hub.

Select Get or Install.

On Windows 10

The Xbox Insider Hub can be installed from Microsoft Store on your Windows 10 PC.

Press the Start button, type store, then select Microsoft Store.

Select Search, enter insider in the box, then select Xbox Insider Hub.

Select Get or Install.

To sign in for the first time (use your gamer tag):

If you weren’t part of the old Xbox Preview Program, you’ll want to search the store for the Xbox Insider Hub. If you were, however, take a look in the updates section of My Games & Apps to update to the Insider Hub.

Accept the terms and conditions after opening up the Xbox Insider Hub

On the main screen for the Insider Hub, go to Insider Content section and select the Xbox One Update Preview section

Simply press the join button on the next page, and you’re in! Just keep in mind that it will take up to 72 hours to start getting preview updates.

Let me know if you have any problems and we will look forward to hearing your gaming feedback

Hello Sífiso how are you?
My name is Ezequiel I'm an Independent Consultant. In order for you to have the betas you need to be part of Xbox Insiders, to sign up for the program it's very simple. Becoming an Xbox Insider is as easy as downloading the Xbox Insider Hub app on your Xbox or Windows device.
To get started with an Xbox console:
Go to Store from Home or select Store from the dashboard.
Select Search.
Enter Insider in the box, then select Xbox Insider Bundle.
Select Get or Install. This will install the Xbox Insider Hub and Report a Problem app.
To start using a Windows device:
Click the Start button , type store, then select Microsoft Store.
Select Search, enter insider in the box, then select Xbox Insider Hub.
Select Get or Install.
For more information about the Xbox Insider Hub and how to get it on your Windows device, go to:

https://support.xbox.com/help/account-profile/manage-account/xbox-insider-hub

If you have any questions, please contact us again.

Good day

I missed understood your question, my apology.

Thought you wanted to get beta on mobile phone.

Taken from Mojang website.

XBOX ONE / WINDOWS 10

You will need to own the digital version of the game. For the beta, disc owners are not supported - sorry!

Joining the Minecraft Beta on Windows 10 or Xbox One:

1. Go to the Store app on Xbox One or a Windows 10 PC.

2. Search for the Xbox Insider Hub app.

3. Download and install Xbox Insider Hub.

4. Launch the Xbox Insider Hub.

5. Navigate to Insider content > Minecraft Beta.

6. Select Join.

7. Have fun and find bugs!

Found on Mojang website.