Uplink Management VLAN of AP cannot be changed after onboarding but can be done before onboarding.
Please refer to the section IP Assignment for Access Points on the user guide linked below.
https://higherlogicdownload.s3-external-1.amazonaws.com/AIO/14a38ed9-49a3-1262-018b-fedf0aec62c5_file.pdf?AWSAccessKeyId=AKIAVRDO7IEREB57R7MT&Expires=1652802629&Signature=Rouc%2F5IcCdNhxXKpkHGIRHrs6CI%3D
Even though the AP management VLAN cannot be changed from VLAN 1, we should be able to handle your deployment where AP will be in default VLAN and clients can be mapped to other VLAN. We recommend chatting with support so that we can help you better.
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Aruba Instant On Communications
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