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The below commands would be entered in the Command Line from either a Telnet, SSH session or from a Console port connection. I have used Adtran switches with UniFi AP's with no issue.
You would first create the new VLAN:
Then configure any port the AP is connected to as the following substitute the X for the switch port number, substitute your AP ID for Y. :
interface switch 0/X
switchport mode trunk
switchport trunk allowed vlan 1,90
Thank you! Your answer came just in time to save my hair.