As part of the NISS (Social Security Number) application process, Portuguese Social Security requires proof that you have applied for residence regularisation. This allows them to evaluate your status before issuing a NISS.
You can submit either of the following:
Option 1: Portuguese Visa Stamp + Proof of National Visa Application
A photo of your passport showing the Portuguese visa stamp.
A copy of the completed national visa application form submitted through VFS.
Option 2: AIMA Confirmation Letter
A document issued by AIMA confirming that your residence permit has been approved.
This letter is provided after your successful AIMA appointment.