Safe-mode returns ["BAD CSRF"] with reverse proxy

I’m helping debug an AWS installation that’s working fine on the current production site.

For Reasons, they want to have an additional NGINX as a reverse proxy to handle some redirections. When the NGINX is added SSO logins don’t work; it as if the login didn’t happen.

When trying safe mode, I get a BAD CSRF after submitting the request to enable safe mode.

I’m not sure if this might be part of the problem we’re trying to solve, but it definitely seems like a problem.

I’m not sure where to look next.

EDIT: Here’s this:

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