Are updates allowed? Formula Issues

[Aplicaciones_Hu]

Im trying to set an expression to limit permission for users & admin

I set the following expression:

IFS(IN(Useremail(), MAIL[MAIL CUADRILLA]),“ADDS_AND_UPDATES”, IN(Useremail(), Supervisores[Email]),“READ_ONLY”,),
,“READ_ONLY”

the problem is when i try to make an “ADD” with a [MAIL CUADRILLA] email that has “ADDS_AND_UPDATES_” allowed.

I get the following error.

idk why, maybe the expression is not compatible?

I try with a “SWITCH” expression and i receive another issue…

ie:

SWITCH(USEREMAIL(),
“user1@mydomain.com”, “UPDATES_ONLY”,
“user2@mydomain.com”, “ALL_CHANGES”,
“READ_ONLY”)

when i make the test the only rule applies is the “READ_ONLY” all the others permissions i set just getting ignore by the app.

Maybe im doing something wrong? I follow some post about this… but i cant find the solution.

Idk why expression is the best to set permissions in the “Updates allowed” section.