Wireless AP FlexConnect mode switchport mode
When configuring a wireless access point to function in FlexConnect mode, it can be connected to a switch using either an access port or a trunk port. In the case of a trunk port, the access point needs IP connectivity on the native VLAN to function.
Links:
https://networklessons.com/cisco/ccna-200-301/cisco-wireless-ap-modes
https://forum.networklessons.com/t/cisco-wireless-ap-modes/8999/18?u=lagapides