Hi ,
Since I did not find any related Microsoft official document, I am afraid there is no such way could switch the SHA-256 HMAC output from 96 to 128 bits.
UserVoice is where you can provide feedback to the Microsoft Product Groups who are now monitoring these forums. You could post the feedback in our UserVoice, here is the link:
https://windowsserver.uservoice.com/forums/295047-general-feedback
Best Regrads,
Candy
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