This can occur is your Outlook application has not been updated.
Older versions of Outlook have limitations when it comes to displaying HTML email messages. Therefore, we recommend updating your application to the latest version. Alternatively, you can view the email in your web browser by opening Outlook there.
When you click on the browser view in Outlook, the email will open in the Microsoft Edge browser. In order to view the email in Edge, you need to make some changes to your browser settings. Please follow the steps below:
1. Go to the settings of your Edge browser.
2. Select "Default browser" from the list.
3. Change the permission from default to "Allow" for the option called "Allow sites to be reloaded in Internet Explorer mode (IE mode)."
These instructions are specifically for users who are using older versions of Microsoft
If the issue continues to occur even after completing the aforementioned steps or if you experience this problem in another application, please don't hesitate to contact our support team. They are available to provide further assistance and will be glad to help you.