When adding a switch with an existing configuration into a group in Aruba Central, the group requires devices to have factory default configurations to allow Central to apply the group config correctly.
If the switch has an existing configuration, synchronization and auto-commit may fail because of configuration conflicts.
Option A: Pending authorization is unrelated to config synchronization.
Option C: Auto-commit can be disabled but does not block syncing existing config.
Option D: VSX support limitations are irrelevant here.
Therefore, the likely cause is that only switches with factory default config can be added to a group with existing config.
[References:, , Aruba Central Device Group Management Documentation, , Aruba Central Configuration Synchronization Best Practices, , HPE Aruba Central User Guide]
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