Issuing the EEOC's broad guidance on harassment in the workplace under EEOC-enforced laws. In part, this guidance indicated the EEOC's position that discrimination based on gender identity or sexual orientation was de facto sex discrimination in violation of Title VII, and indicated that actions by an employer like misgendering, deadnaming, and unequal bathroom access all amounted to sex-based discrimination.
https://www.eeoc.gov/laws/guidance/enforcement-guidance-harassment-workplace