Hey Mhhan,
Please note that 17.11.1 is not a supported device as of DNA version 1.3.1.4. Can you please downgrade to a supported version of code for the 9500 Catalyst switches, re-sync the device, and re-attempt the LAN automation task?
Also, make sure you have CLI credentials & SNMP community specified and selected for the site you are using for the LAN automation task:
-- Check DNAC GUI -> Design -> Network Settings -> Device Credentials -> Select the Site/Building you are using for the LAN automation job -> Is a CLI & SNMP entry selected?
DNA / SDA Compatibility Matrix:
-- https://www.cisco.com/c/en/us/solutions/enterprise-networks/software-defined-access/compatibility-matrix.html
If you are still facing issues after checking the suggestions above, please open up a service request with TAC so they can assist with troubleshooting this problem.
Best Regards,