https://arstechnica.com/tech-policy/2022/11/musk-bans-remote-work-at-twitter-warns-staff-of-dire-economic-outlook/

Elon Musk reportedly told Twitter staff in an email Wednesday that he is banning remote work and that any exceptions to the ban must be approved by Musk himself on a case-by-case basis. The new rules "will expect employees to be in the office for at least 40 hours per week, he added," Bloomberg reported.

The change takes effect today. "Obviously, if you are physically unable to travel to an office or have a critical personal obligation, then your absence is understandable," Musk wrote in yesterday's email, according to the Verge.