I'm not certain then without seeing the rest of the controller-info.xml (don't attach it, it's private) but can you verify it's filled out correctly, you're filling out the correct one (the one in the machineagent4.5.### folder, not the root one) and your ports are open between your controller and those servers? If you mark the agents as "false" for SIEM enabled, do they appear as normal machine agents? Another place to check is the logs folder in the machineagen4.5.### folder. They should tell you if they're trying to connect to the controller but failing.
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