Hello ,
Good to see you in Microsoft Community.
Based on the information you provided, it appears that the security policies of the site you are trying to access restrict user access (meaning you do not have permission to access the site in the current environment). You would need specific access privileges on specific devices within a particular network environment to visit the site.
You may reach out to the site administrator for more specific information.
Best Regards,
Mosken_L - MSFT | Microsoft Community Support Specialist