Update a bolean field with a custom function

Update a bolean field with a custom function

Hi!
I want to update the field "isAccountTicketsViewable"
from true to false.

I have a workflow rule that trigger when the field "Account" of a contact is modifyed. When the rule trigger I wanto to update that field.

I write this funcion and mappde ConctaId with Contact ID but the fild does not update:

updatecontact = zoho.desk.update(xxxmyorgidxxx,"contacts",ContactID,{"isAccountTicketsViewable":false});
info updatecontact;

Someone can help me?