C9120AXI Not getting IP/Joining EWC on WS-C3850-48P

[ShahrulEzwvn]

Solved. 

[marce1000]

  - Post the ap boot process and check the logs on the EWC too when the access point tries to join.

 M.

[ShahrulEzwvn]

Solved. 

[Rich R]

Based on the title I suspect the answer here was that WS-C3850-48P cannot run EWC so there is no way a 9120 could ever join a WS-C3850-48P.  EWC is only supported on (some) Catalyst 9xxx APs and on some Catalyst 9x00 series switches for SD access (fabric) only (no more standalone EWC on Catalyst switches)
https://www.cisco.com/c/en/us/products/collateral/wireless/catalyst-9800-series-wireless-controllers/nb-o6-embded-wrls-cont-ds-cte-en.html
https://www.cisco.com/c/en/us/products/collateral/wireless/catalyst-9800-series-wireless-controllers/guide-c07-744299.html

[ShahrulEzwvn]

Thanks for the comments. Actually, it required to configure the ip address AP since i only configured the ip address for EWC. 

[Rich R]

Then maybe you're confusing EWC and Converged access which run on 3850 before Cisco scrapped the whole idea?
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3850/software/release/16-1/converged_access_deployement_guide/m_conAccess_deploy_guide/converged_access_solution_overview.html

But converged access never supported 9120 APs:
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3850/software/release/16-1/converged_access_deployement_guide/m_conAccess_deploy_guide/converged_access_solution_overview.html#concept_EE2ADB184D984E689FADD13B78D14DBA

So something still doesn't compute ...

And for IP addresses - DHCP always comes in handy for APs and then you can use option 43.