The customer authorization (provided in the link you clicked) is out of date, and does not entitle you to use the Blended Threat service.
https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fforceschildrenseducation.org.uk%2F&data=02%7C01%7C%7C6184c370a11440dbec8f08d690491c87%7Cbe7760ed5953484bae95d0a16dfa09e5%7C0%7C0%7C636855042029621100&sdata=b0gaoEKE5PrNCVElregxLpOriJqpgH9%2B5rmnmjHInQ8%3D&reserved=0