I wonder if it is because you have not specified a server name?
Maybe it is looking at the local server, which happens to be a background or standby server?
Documentation:
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Execute the following command on the application server that you want to stop:
pdm_server_control -q interval -s server_name
-q interval -s server_name
Notifies a local or remote application server to quiesce in a specified time interval. This
interval is the number of seconds before the server goes offline. When using this option
without a server_name, the local server is notified to quiesce. This option cannot be used
for a background or a standby server.
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And as per Alexander, please let us know the outcome of the Support issue.
Thanks, Kyle_R.