1. Ensure that the Occupancy Attribute is registered correctly and supports ACCESS_CONTROL_REPORTABLE.
2. Confirm that the ZCL_CLUSTER_MS_OCCUPANCY_SENSING binding request has been received.
#2. Yes.
#3. It should be caused by binding failure.
Pls check if your bound table is full, and you can modify APS_BINDING_TABLE_NUM to adjust the size of the bound table.
In addition, you can capture the data packets and track the binding failure status.