Do notaries require both parties to an agreement be present at the same time for notarizing?

It is essential that both the parties are required to sign before notary public to affirm the contents and their signature in the agreement.

Thank you advocate Kalaiselvan.  I have evidence that both parties were not present at the same time. Does that make the Agreement's notarization aspect null and void? And if so, under which provision of the law? Notary Act? Or any other act? This information would be extremely USEFUL.

Highly appreciate your continued help.

Thank you so much. Very useful. Highly appreciate the efforts taken to reply.

You are welcome for your appreciations. 

Certainly, it is the legal requirement that the parties need to sign the document in the presence of the notary. However, to my knowledge, there is no requirement that all the parties ought to be present at the same time.

If both parties are not present at the same time the reliability will be somewhat compromised I think. Specifically if parties come days apart, then the date of the document certainly becomes a disputed subject. But I think that there is no provision in the law to address such issues of Notarization.

If we keep suspecting unsustainable issues then we may not be able to proceed or see any progress in matter at hand, hence at times we may have to be little flexible in our approach to certain extent.

There are some documents that are to be executed in front of the notary. There are other type of documents already executed by the parties with or without witnesses and the got notarised by a notary. The query here applies only to the former type of documents. Such documents are later produced elsewhere as evidence. The former type of documents may not have been actually signed by both the parties at the same time and got notarized. But it will not be evident from the appearance of the document itself and it will be difficult to prove otherwise unless the parties themselves and their witnesses, if any and the notary refute.

Wills have to be signed by the testators in the presence of witnesses. But if it was not done so but the witnesses affirm that it was signed in their presence nothing can be done.

Good classification. I am referring to the former type. 

..."But it will not be evident from the appearance of the document itself and it will be difficult to prove otherwise..." Here one party is refuting but the notary will not refute because then he will be admitting his error.