Cisco Catalyst 3650 Series

When you enable debugging on a switch stack, it is enabled only on the active switch. To enable debugging
on a stack member, you can start a session from the active switch by using the session switch-number EXEC
command. Then enter the debug command at the command-line prompt of the stack member.
Command Reference, Cisco IOS XE Everest 16.5.1a (Catalyst 3650 Switches)
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debug ilpower