The Notary Signing Agent has commenced a loan signing with a borrower and the borrower’s mortgage broker. The mortgage broker asks to speak in private with the borrower for a few minutes. The Notary Signing Agent returns to find the mortgage broker alone and all the documents signed.

the Notary Signing Agent must not validate the document

Explanation:

Based on the information provided within the question it can be said that in this scenario the Notary Signing Agent must not validate the document. This is due to the fact that the main responsibility of the Notary Signing Agent is to oversee the signing of the document and make sure that both correct parties understand all the details and signs for themselves. Therefore since the document was signed without the Notary Signing Agent present then the Agent cannot add his notarized seal.