Ideas
it's a workaround for kick off mode and career mode on console,i play on xbox series s
doesn't fix linkup issue on 2nd controller at kick off but it remains custom A at 2nd controller
for 2 controllers you need 2 accounts and 2 ea accounts(if you have 4 controllers you need 4 accounts and 4 ea accounts)
you already have set your main account,log off
enter on your 2nd/new account,add a different ea account,at settings-customise controls make your custom A layout,save profile,exit game
log in your main account with 1st controller,enter in fc26,remain at main menu
now with 2nd controller go at settings ->profile,you must select controller 2 and link the 2nd account to it(main account remains controller 1 and active profile)
still with 2nd controller go from profile to settings-customise controls to create again your custom A layout and save it(not as temporary)
go back at main menu with 2nd controller
now with 1st controller go at kick off or career mode
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in case you do gamesharing it's different with secondary accounts for one user
2 xbox consoles,you bought fc26 and you do gamesharing with your brother
your account must be set as xbox home on brother's console and his account set as xbox home on your console
after you can delete your account from brother's console so he doesn't enter by mistake on your account,you delete your brother account from your console so you don't enter by mistake on his account....accounts remain set as home despite you delete them
on your brother console any secondary account will work fc26,upper method will work at him
on your console fc26 will work only on your main account,so you must do extra steps on your secondary accounts
extra steps are(i'm a xbox user) :
log off from main account,delete fc26
log on secondary account,go to xbox store and buy fc26 showcase because it's free version
download fc26 showcase,enter in game,link a different ea account,make your settings,exit game,delete fc26 showcase
install full fc26 game and then do the upper method
edit: i played sunday fc26 career mode with my nephew and both used locked player,i couldn't made custom A for 2nd controller
today i made a little effort and succeded it