Twitter sued over $1.9 million invoice that advisory firm Innisfree M&A claims went unpaid

• Innisfree M&A claims it was hired to facilitate communications between Twitter and shareholders last year.
• After Musk's acquisition was finalized, Innisfree sent Twitter an invoice for $1.9 million, which was "processed" a month later.
• The suit claims Twitter has not responded to Innisfree's invoice and letters since December.

A lawsuit filed Friday in New York State Supreme Court by Innisfree M&A Inc. alleges that Twitter never paid the advising firm over $1.9 million for services the company performed during the sale of Twitter to Elon Musk last year.

In the suit, Innisfree alleges that it was hired last May to help facilitate communications to shareholders about the September meeting in which they would vote on Musk's potential purchase of the social media giant.