Unexpected Expression in various Calculated columns

Hello, im currently working on automatization of debt analysis, and currently im having some issues with some dax calculated columns, all of which appear to work correctly, although a red bar appears in my code editor, and when i put my mouse over the last parenthesis, suddenly it appears a "Unexpected Expression" Message, which messes up my data view tab. Im wondering if having accent marks over my data or columns is the issue here.
The Calculated columns that have this type of issue are:

Antiguedad Meses = 
DATEDIFF ( 'Maestro Zuora'[Fecha Emision], EOMONTH ( TODAY(), -1 ), MONTH )

Compañía = 
IF (
    LEFT('Maestro Zuora'[WBE],4) = "CL25",
    "CL25",
    IF(LEFT('Maestro Zuora'[WBE],4) = "CL13","CL13",
    IF('Maestro Zuora'[Cuenta: Legal Entity] = "EnelX","CL25",IF('Maestro Zuora'[Cuenta: Legal Entity] = "EnelDistribucion","CL13","CL36"))
))

Antiguedad Maxima = 
IF (
    'Maestro Zuora'[Número de Factura Asociada]  = BLANK (),
    'Maestro Zuora'[Antiguedad Meses],
    CALCULATE (
        MAX ( 'Maestro Zuora'[Antiguedad Meses] ),
        ALLEXCEPT (
            'Maestro Zuora',
            'Maestro Zuora'[Número de Factura Asociada]
        )
    )
)

Negocio = 
SWITCH(TRUE(),
LEFT('Maestro Zuora'[WBE],8)="CL25E400", "eCity",
LEFT('Maestro Zuora'[WBE],8)="CL25E500", "eHome",
LEFT('Maestro Zuora'[WBE],8)="CL25E600", "eIndustry",
LEFT('Maestro Zuora'[WBE],8)="CL25E700", "eMobility",
LEFT('Maestro Zuora'[WBE],8)="CL13E400", "eCity",
LEFT('Maestro Zuora'[WBE],8)="CL13E500", "eHome",
LEFT('Maestro Zuora'[WBE],8)="CL13E600", "eIndustry",
LEFT('Maestro Zuora'[WBE],8)="CL13E700", "eMobility",
"NA"
)

This is the data model i'm working on:

And Also the error message:

And finally here's how this messes up my dataview tab