Im having a lot or problems with Exel Autentifications
nauthorized_client: The client does not exist or is not enabled for consumers. If you are the application developer, configure a new application through the App Registrations in the Azure Portal at Microsoft Azure.
Hello Nicolas_Aparicio_Lan, welcome to n8n community! I’ll try my best to help yaa.
I think this error means the Microsoft Excel (Graph API) credentials in n8n are not yet registered correctly in Azure, there are several point that you can fix it::
- You can go to Azure Portal and then App Registration.
- Create a new App Registration (you can choose “Accounts in any organizational directory and personal Microsoft accounts“ if you want to use consumer logins).
- Copy the Application ID and directory id into your n8n Excel node credentials.
- Under Certificates & secrets, generate a new Client Secret and add it in n8n.
- Under API permissions, add Microsoft Graph and then Delegated and then Files.ReadWrite (and grant admin consent)
- and the last is save, do reconnect in n8n, and the Excel authentication should will work.
Maybe thats all i can share to you, hope this will works! 
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