thanks! it works!
If this can help, this is what I did to get this working, but first some things:
A) I have been playing the game for 2 weeks, normally (without cheat/mods)
B) I linked my account to my Fb
C) I downloaded the full game using ApkPure app
so what I did:
1) Backup the folder /Android/obb/com.ubisoft.accovenant (remember step C)
2) Unninstall the Facebook app
3) Download the AC_Rebellion_2.9.2_TheArmKing_Signed.apk from here
4) Unninstall the game
5) Install the apk from step 3
6) Restore the backup from step 1
7) Open the game and restore the save with Facebook
8) Now I can continue my save with the mod working.