Megyn Kelly was supposed to bring star power to NBC News and a bigger, broader audience of morning viewers to its “Today” show franchise.

Instead, the three-year, $69 million bet to woo Ms. Kelly from her conservative prime-time perch at Fox News is backfiring.

Since taking over the 9 a.m. hour of the lucrative morning show in September and rebranding it “Megyn Kelly Today,” Ms. Kelly has struggled to make the shift to daytime broadcast television, with its delicate balance of soft features and hard news. Her ratings declines and higher production costs have been a drag on a critical franchise for NBC.

“I need to introduce myself to people who don’t know me or know some bastardized version of me that they’ve gotten from a website or a TV show,” Ms. Kelly said in an interview. “There are definitely some who only know me through some caricature they learned about on ‘The Daily Show.’ ”

Some of NBC’s affiliate TV stations are unhappy with the drop in viewers, and staffers on other NBC News shows have been grumbling about Ms. Kelly’s lofty budget. Hollywood publicists started steering their A-list talent away from the program when a feud erupted with Jane Fonda after Ms. Kelly asked the actress on-air about her plastic surgery.