A few years ago, we released the ability to add web content to dashboards, which was enabled by default. If your tenant admin kept the feature enabled, you could add or view HTML content as a tile on your dashboard:
Since the feature allows for any embedded HTML, enabling the feature may expose your organization to security risks via malicious web content. Due to these risks, many admins have already disabled the feature. To ensure each tenant is secure by default, we are disabling the tenant setting by default. This change will be rolling out to tenants this week. If you would like to create or view web content tiles, please contact your tenant admin, who can opt to enable the feature for your entire organization, specific users, or groups.