To identify why you receive error code 155 when deploying Sophos Cloud
Error code 155 according to Sophos is:
Installation blocked because tamper protection is enabled
Disable any previous versions of Sophos and try installing again.
IMPORTANT: In certain cases where Sophos Tamper Protection is enabled and Sophos Firewall is installed, Sophos may turn on the firewall if it detects a certain level of tampering. Depending on the settings, this can stop ingress and egress network traffic from the machine, requiring a local login and manual disablement of the Sophos firewall.