Cannot crate ap-manager interface

Hello everybody hope you are doing great!
Yesterday I was in one of our client premises configuring a WLC 5508 with software 7.2, went through the initial configuration wizard with no problem whatsoever, my issue began when trying to configure a ap-manager interface.
In many WLC configuration guides cisco states that for 5508 it is not required to configure an ap-manager interface because the management will suffice, but then they put a side note recommending it's configuration for best practices and better performance. OK so I saw that in an earlier version document and now they do not make the recommendation but the still use the word required and for me that's still is not a limitation.
Well anyways, I can't create the ap manager interface because when I put the VLAN ID it says the it is being used by another interface. Any help?
Thank you in advance

For 5500 series controllers, you are not required to configure an AP-manager interface,
the management interface acts like an AP-manager interface by default.
If desired, you can disable the management interface as an AP-manager
interface and create another dynamic interface as an AP manager.
Make sure that you have disable the option of ap manager on the management interface before creating the new AP manager interface and on the 5508 WLC the AP-manager interface can not be on the same VLAN as the managment interface like on the old WLCs.

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    hvac 1 268 172.19.15.8 Dynamic No
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    Take a look at this documentation:
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