Trying to join realms gives me this weird error message

Looks like Realms is trying to show webpage code called HTML (press Ctrl-U) as an error message. I can make out a centered header saying 504 Gateway Time-out, a line, then centered Microsoft-Azure-Application-(cut off)

Duplicate of REALMS-4233.

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We're tracking this issue in REALMS-4233, so this ticket is being resolved and linked as a duplicate.

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