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This removes the function of “right to repair” as you cannot replace the sensor/button on your own without having to go to a certified facility to do the repair there. So…that being said, if the process wasn’t done via AST 2 with a certified repair facility, chances are on T2 macs, the touch ID won’t work. Only certified techs can run the tool via the AST 2.if replacing the top case, you need the top case serial number of both top cases) AST 2 can only run the serialization if it has both the old and new serial numbers (i.e.The only way to “initialize/serialize” the Touch ID is by running a diagnostic/serialization via AST2.The power button/function will still work, but the security of the Touch ID will not work until you serialize it.if you kept your motherboard but got a new top case or Touch ID, only a certified repair can initialize the secure enclave within the Touch ID sensor) The reason for the above is because the Touch ID needs to be “Serialized” to the new/existing motherboard (i.e.When doing a replacement/swap of the top case and/or Touch ID sensor, it needs to be logged into AST 2 as being performed by an Apple Tech or Certified Apple Repair Facility.I went digging into the Apple Documentation and also to an Apple Store to speak to a Genius and this is what I found: So, I had a similar issue and did everything that the above mentioned.

Fingerprint reader for mac os