The report, sent to NBC employees on Wednesday morning, did include some caveats.

One woman, who eventually came forward about a sexual encounter with Mr. Lauer, said she told a manager in 1996 about an interaction where Mr. Lauer “placed his hand on her thigh and made a sexually suggestive comment.” The manager, who was not identified, agreed at the time to reassign the woman so that she would not travel alongside Mr. Lauer.

The report also said that, of four women who filed complaints about Mr. Lauer’s misbehavior, two believed that senior managers at NBC News and the “Today” show were aware of the anchor’s sexual misconduct. “The former leaders with whom we spoke denied any such knowledge, however, and we were unable to otherwise substantiate it,” the report said.

NBC’s investigators said they interviewed 68 individuals for the report, including current management at the news division and current and former members of the “Today” staff. The report indicated that former NBC News executives were contacted, but did not say whether interviews with those executives had taken place.

Following the release of Wednesday’s report, the woman who accused Mr. Brokaw, Linda Vester, wrote an op-ed column in The Post that criticized NBC for relying on its own in-house counsel.

“I want NBC to stop fighting #MeToo within its own walls,” Ms. Vester wrote. “I ask NBCUniversal to retain an outside investigator to look into sexual harassment and any coverup of sexual harassment at NBC News.”

An advocacy group that grew out of the #MeToo movement, Press Forward, also issued a statement describing the nature of NBC’s review as “an inherent conflict of interest.” The group, which is focused on improving workplace environments for women in the media industry, added, “No one is going to be fully candid when speaking to management for fear of losing their jobs.”

If there was criticism to be found in the NBC report, it came in an assessment of NBC News’s human resources operation. The investigators found it “troubling” that no formal complaints had been filed about Mr. Lauer despite his engaging in sexual relationships with subordinates. The report found that network staff members were fearful of retaliation and did not feel confident that their complaints would be kept confidential, in part because human resources managers occupied glass-walled offices in full view of other NBC News employees.