Elon Musk has banned Twitter employees from working remotely, saying they need to spend 40 hours a week in the office unless he gives his express permission otherwise. Bloomberg reported from the company’s first official all-hands communications from Musk since bought the platform. He said workers need to prepare for “difficult times ahead” for advertising-led business like Twitter, and that he wants to see subscription fees account for half the company’s revenue.

Twitter fostered a remote work culture during the pandemic, allowing many employees to work from home. It also instituted regular additional rest days for employees, another initiative Musk has axed, saying that Twitter’s turnaround will require “intense work.” Musk ’s other companies, SpaceX and Tesla, also require mandatory in-office work unless management specifically approves it. When he wrote to both sets of workers, he said that visibility was key for senior leadership, who should be seen to be working alongside their subordinates.

Musk added in his remarks that the company’s first priority — after completing the rollout of Twitter Blue — is to address his concern around automated accounts. A key pillar of Musk and the company’s fight, prior to acquisition, was the billionaire’s belief that the company was under reporting the amount of fake accounts running on its platform.