Updated at 4:38 p.m. to include comment from Daniels' attorney Michael J. Avenatti.

Texas officials are investigating whether a Dallas-area notary properly signed off on Stormy Daniels’ agreement to stay quiet about her alleged affair with President Donald Trump.

The notary issue is the latest in a string of curiosities surrounding the murky deal involving Trump personal lawyer Michael Cohen and the adult-film actress, whose real name is Stephanie Clifford.

A notary in Forney, where Daniels lives, did not sign and date the 2016 agreement, which was finalized a few days before the presidential election. She also did not provide a certificate reflecting whose signature she was witnessing, according to the Texas Secretary of State.

Notaries are third-party witnesses tasked with verifying that real people are signing legal documents.

Texas law requires that notaries not only stamp documents, but sign and date them. They also must provide a certificate reflecting that they verified the identity of the signer or signers.

In a letter to the notary obtained by The Dallas Morning News, a secretary of state employee informed the notary that the agency is examining her actions following a complaint.

“Attaching your seal to a document without a notarial certificate constitutes good cause for the secretary of state to take action against your notary commission," Maria Y. Morales wrote in a March 9 letter.

The notary, Erica Jackson, told The News in a brief conversation Friday that she could not recall the document and declined to be interviewed. She could not be reached Monday for comment about the complaint. Daniels' attorney also could not be reached.

Copies of the agreement were posted online last week, drawing questions about Jackson’s missing signature. A complaint was soon lodged with the secretary of state, which regulates notaries.

Last week, Ted David, a retired CNBC reporter and notary, pointed out the error on Twitter and complained to state authorities.

He noted that while Jackson's stamp is visible on the agreement, there's no signature or date from her anywhere on the document.

"So I'm looking at this thing and what disturbed me is she notarized a blank signature line," David told The News. "What is she notarizing?"

The nondisclosure agreement allegedly refers to Trump and Daniels by aliases: David Dennison and Peggy Peterson. The White House also has denied any knowledge of a $130,000 payment accompanying the agreement and the affair itself.

Daniels sued Trump last week in California, claiming the pact is invalid because Trump never signed it. Daniels' attorney Michael J. Avenatti told The News the missing notary signature was not important. Trump's missing signature from the original nondisclosure agreement is more important, he said.

"The issue is the lack of the signature by Mr. Trump as required under Section 8.6 of the draft agreement, not any issue involving a notary," he said.

Sam Taylor, a spokesman for the secretary of state, stressed that the office is looking into a narrow issue: “whether or not the individual complies with his or her duties as a notary public in the state of Texas.’’

Daniels' suit states she had an "intimate relationship" with Trump after meeting him in 2006 at Lake Tahoe, Calif. It was a relationship, her lawsuit states, that continued into 2007.

Cohen acknowledged that he paid Daniels the $130,000 and has tried to stop her from speaking about it.

On Monday, The New York Times reported that Daniels has offered to return the money to be free of the requirement she stay silent.