I don’t think it is possible but I do not know that for certain. I hope one of the formal support person can confirm:
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You cannot show the 12 word passphrase. The passphrase/seed is never stored on any server. It only appears once and only client side.
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Segwit addresses do not have an associated private key. They are generated using the 12 word seed.
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If you can recall most of the seed (like 10 words) you might be able to brute force the remaining 2 using command line tools.
Refs: