The security policies causing the customer to be blocked are likely geolocation filtering or geo-blocking, which restrict access based on the user's IP address location.
The security policies in question are likely geolocation filtering or geo-blocking measures. These policies are set up on firewalls to restrict or allow traffic based on the originating country or region of an IP address. Organizations implement such policies to mitigate risks associated with traffic from parts of the world that may have higher instances of cyber threats, to comply with legal or licensing requirements, or to manage bandwidth. When legitimate users, such as the customer on TDY (temporary duty), encounter these blocks, they may require an exception within the security policy to gain access.