> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://help.myndr.nl/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# Prevent signing in to a Chromebook with a personal Google account

|| The setting below is required for Myndr to work properly!
Some students get around the rules you set with the Myndr Switch by signing in to the Chromebook with a personal Google account. This is easy to prevent by configuring in the Google Admin console that only a school account may be used to sign in on the school's Chromebooks.

### 1. Prevent signing in to a Chromebook with a personal account

In the Google Admin console, go to:

|| Devices > Chrome > Settings > Device settings
On the left, choose the organisational unit (OU) that contains the devices you want to restrict.

Scroll to the Sign-in settings heading and click Guest mode.
Under **Configuration**, choose **Disable guest mode**.

Click **Save** at the bottom.

Go back to Device settings

Scroll to the Sign-in settings heading again and click **Sign-in restriction**.
Under **Configuration**, choose **Restrict sign-in to a list of users** and enter the students' email domain, using a wildcard.
E.g. `*@ourschool.nl`.

Click **Save** at the bottom.

From now on, students can only sign in with their school account!

|| Handy: if the students also use the Chromebooks outside school, you can set the times at which these restrictions do not need to apply under "Off hours".
### 2. Prevent adding extra accounts

You also need to make sure that no extra accounts can be added:

In the Google Admin console, go to

|| Devices > Chrome > Settings > Users & browsers
On the left, choose the groups or organisational unit (OU) that contain the students you want to restrict.

Click **+ Search or add a filter**, type `sign-in to secondary accounts` and press Enter.

Click **User experience** > **Sign-in to secondary accounts**

Select **Block users from signing in to or out of secondary Google Accounts**

Click **Save** at the bottom

Now students can no longer sign in to the Chromebook with a non-school account, and they cannot add one once they are signed in either.