To do this you need a REAL/RETAIL/FACTORY copy of Zelda Twilight Princess for Wii.
You CANNOT run a BACKUP/DOWNLOADCOPY of Zelda Twilight Princess for Wii.
And because you bought the Wii in France I asume it's a PAL version, so you need a PAL version of the game also.
Little update:
I made a backup of my original AC savegame to SD and deleted the savegame from the Wii.
Created a fresh new game, played all Nook's things and requested a friendcode from the guard.
Added some friends to the 'Friendslist' and asked the guard to open the ports (invite people)...
No secret key available. Keyring does not have the secret key (0x04111A8E80380320) needed to decrypt this message.
...
Seems you not only need the PASSWORD but also the SECRET KEY
I haven't played my Switch n a month or so, just been playing Xbox, and just picked to play lil and Damn that A and B, X and Y being reversed always gets me.
I agree Tears is great. I even played thru it completely twice. I've been hooked on playing thru Fallout 4 again though, after they released the next gen version for Series S/X. Is pretty cool update.
because I already got burned out with breath of the wild, which for the most part is essentially the same game, and then again with master mode, which doesn't work as a new game plus (that always felt bizarre to me)