Sooo. I'd setup a seed for a mate. Via passphase & Bip85 Derived from one of my seeds. He didn't correctly record upper/lower case on passphrase. BUT his seed did work when we imported to another mates Trezor.. I remember testing the bip85 and passphrase.. Wasn't clear enough when explaining Case sensitivity it seems.. Was going to make him whole if it was a me F/U.. Glad I didn't have to!