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I noticed that you use English in your messages even though it is a Portuguese-speaking forum; I will therefore continue in English so that my answer is as clear and useful as possible. If you'd prefer me to switch to Portuguese, please let me know and I'll gladly do so.
Dear @Lurdes Ramos,
Good day! Welcome to Microsoft Q&A forum!
Based on your description, I understand that Lurdes Ramos has requested a completed RFI-21 form and a Fiscal Residence Certificate from your company to support the application of the Portugal double taxation treaty and avoid the 25% withholding tax on payments made to your organization.
Thank you for reaching out and for providing the details regarding the RFI-21 form and Fiscal Residence Certificate request.
Regarding this situation, @Daniel-Vo could you kindly help the customer with this request? I appreciate your support!
They will assist in verifying the information and guiding the next steps as needed.
Thank you for your patience and understanding.
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