No permission to execute Function (with all permissions)

I've been getting the same error after executing a function, which updates the currency exchange value on Company Details via restAPI. The error is the following:

{"code":"NO_PERMISSION","details":{},"message":"permission denied","status":"error"}

Since i do not have all permissions enabled, i tried running it with an Admin account, but it still did not work. Why i is my permission denied even though i tried executing it with the admin account? I checked all the scopes in the connection as stated on the documentation.

Do i need another config that enable me to update the Company Details page? I used the following documentation: https://www.zoho.com/crm/developer/docs/api/v2/update-currencies.html

I included my code in the attachment files if needed!