You cannot install agents for Symantec Endpoint Protection Small Business Edition cloud (SEP SBE) when Malwarebytes is already installed on the computer.
You also see an error message with a random reference code..
The randomly generated reference code is unique.
Malwarebytes can be flagged by the SEP SBE installer as competitive software, which often results in a halted installation.
You need to fully uninstall Malwarebytes before installing SEP SBE. Once installation of the SEP SBE agent is complete, you can reinstall Malwarebytes.