AP3802 cannot join wlc

[eigrpy]

Hi, AP3602i cannot join WLC3504. Anyone can help to take a look at the below messages. Thank you

[*04/12/2021 15:46:59.6862] CAPWAP State: Discovery
[*04/12/2021 15:46:59.6885] Discovery Request sent to 10.10.10.3, discovery type STATIC_CONFIG(1)
[*04/12/2021 15:46:59.6906] Discovery Request sent to 10.10.10.3, discovery type STATIC_CONFIG(1)
[*04/12/2021 15:46:59.6933] Discovery Request sent to 255.255.255.255, discovery type UNKNOWN(0)
[*04/12/2021 15:47:09.3790]
[*04/12/2021 15:47:09.3790] CAPWAP State: Discovery
[*04/12/2021 15:47:09.3810] Discovery Request sent to 10.10.10.3, discovery type STATIC_CONFIG(1)
[*04/12/2021 15:47:09.3857] Discovery Request sent to 10.10.10.3, discovery type STATIC_CONFIG(1)
[*04/12/2021 15:47:09.3871] Discovery Request sent to 255.255.255.255, discovery type UNKNOWN(0)
[*04/12/2021 15:47:19.0718]
[*04/12/2021 15:47:19.0718] CAPWAP State: Discovery
[*04/12/2021 15:47:19.0739] Discovery Request sent to 10.10.10.3, discovery type STATIC_CONFIG(1)
[*04/12/2021 15:47:19.0755] Discovery Request sent to 10.10.10.3, discovery type STATIC_CONFIG(1)
[*04/12/2021 15:47:19.0768] Discovery Request sent to 255.255.255.255, discovery type UNKNOWN(0)
[*04/12/2021 15:47:28.7647]
[*04/12/2021 15:47:28.7647] CAPWAP State: Discovery
[*04/12/2021 15:47:28.7668] Discovery Request sent to 10.10.10.3, discovery type STATIC_CONFIG(1)
[*04/12/2021 15:47:28.7683] Discovery Request sent to 10.10.10.3, discovery type STATIC_CONFIG(1)
[*04/12/2021 15:47:28.7698] Discovery Request sent to 255.255.255.255, discovery type UNKNOWN(0)
[*04/12/2021 15:47:38.4577]
[

[marce1000]

 - Presumably the AP has been using another controller in the past , on the AP issue : 

capwap ap erase all

      then try again

 M. 

[Leo Laohoo]

This is NOT a vWLC, right? 
What is this?  3504/5520/8540?  Have you enabled the AP RTU license?

[eigrpy]

capwap ap erase all

not work

its wlc3504 

[Leo Laohoo]

In CLI of the WLC, post the complete output to the following command: 

sh ap join detail <AP MAC ADDRESS>

[Scott Fella]

Your title states 3802, but your post states 3602?