Hello bro! Hoping you are fine. You can also check the SN in the OMU portal, please check below steps:
1. Log in to the OMU portal as the Admin user.
2. Choose License > View SN and ESN.
3. Select a node from the system domain list on the left pane and click Obtain SN and ESN.
The SN and ESN of the server are displayed.
4. Click Export to export the obtained SN and ESN.