Hi all,
Same issue for me on a Mi Pad 5, trying to use a Swiss french layout on the genuine physical keyboard cover. After setting the sf layout in the physical keyboard settings, letters will work but none of the symbols, accents etc will be on the right keys. Those are stuck on English US. This btw applies to ALL keyboard layouts I tested. And yes, this is 100% a Miui firmware issue, not Android related.
The only way I see to have this fixed would be either to use a fixed custom rom, or have Xiaomi fix this in an upcoming patch...
Unbelievable that this issue has apparently been reported a while ago but still wasn't fixed. I mean, I bought their genuine physical keyboard case, they sell it as an accessory so it should work flawlessly! The hardware part is great, so having it fail on something as silly as a software bug is maddening...
I reported this via the xiaomi support email and suggest you all do the same, maybe this will get them to fix it if they get enough requests... Though I have my doubts... Damn it, it's brand new and otherwise a great device...