1.NXP does not support customer programming of HDCP keys for IMX8MQ.
2.For NXP programmed HDCP keys, the customer is first confirmed as an “HDCP adopter”. Once confirmed, a special part number will be configured for them. This allows NXP to track which customers receive a particular HDCP key. NXP uses their own keys to program the devices.
You need create a SFDC ticket for this issue.