This appears to be a company policy. Access to this URL has likely been blocked on the internal network, as it may provide access to personal or remote systems, potentially resulting in a DLP violation.
If you are trying to access “home lab” resources…. you could always setup a docker running a cloud flared tunnel; then configure zero trust with permissions you find acceptable…. then get to your KVM that way. Bypasses the cloud portal; our Cisco umbrella policy hasn’t had an issue with it so far.
alternatively, have you tried accessing the cloud via direct IP and not going through the domain name?