TikTok stated the Biden administration lacks "clarity and assurance" to prevent the ban

TikTok said it will be forced to “go dark” in the US on Jan. 19 unless there is a clear statement from the Biden administration to service providers that are maintaining its availability.
Statements issued on Friday by the White House and the Department of Justice “have failed to provide the necessary clarity and assurance” to the service providers, the company said in a post on X.
“Unless the Biden Administration immediately provides a definitive statement to satisfy the most critical service providers assuring non-enforcement, unfortunately TikTok will be forced to go dark on January 19,” it said.