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BQ27Z746: The HMAC SHA256 Keys

Part Number: BQ27Z746
Other Parts Discussed in Thread: BQKEYPACKAGER, EV2400

Hi, teams, 

I'm going to use the gauge's authentication function to implement the need to recognize certified batteries.

Now I know the caculation of HMAC SHA256, but don't know about the secure key store in bq27z746.

In the TRM it say like:

10.2.1 Secure Key
The secure key is stored in the secured memory of the BQ27Z746 device. It is located in secure memory, which
can store up to three secure keys.

So My question is:

(1) What's the default secure key for HMAC SHA256 caculation?

(2) Is the AltManufacturerAccess() 0x0035 Security Keys function read out the HMAC SHA256 keys?

        like Unseal Key 0x36720414 is HMAC SHA256 KEY1, Full Access Key 0xFFFFFFFF is HMAC SHA256 KEY2, lifetime reset key is the HMAC SHA256 KEY3?