Disable ‘The current web page is trying to open a site in your Trusted sites list. Do you want to allow this?

If you want to switch from your portal.microsoftonline.com to (for example) your Outlook from the Top bar you receive the following message:

The current webpage is trying to open a site in your Trusted sites list. Do you want to allow this?
Current site: https://www.outlook.com
Trusted site: https://login.microsoftonline.com

To resolve this message you need to change the security settings in your Internet Explorer.

1. Start Internet Explorer

2. Go to Internet Options

3. Go to Tab Security and click Custom Level

4. Change the value from "Websites in less privileged web content zone can navigate into this zone" from Prompt to Enable

5. Restart your Internet Browser and the pop-up not shows up again