Yes, I tested on multiple devices and browsers, and it’s not related to browser extensions.
What I’m seeing is user-specific, not device-specific:
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On any device where the admin account was already logged in, opening the site immediately results in 502 Bad Gateway.
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In incognito/private mode, the site loads normally and I can reach the login page.
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From there, I can log in successfully with another (non-admin) account and the site works fine.
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But when I try to log in with the admin account, right after submitting the email and password, I consistently get 502, and the page never loads.