[BLOCKER] Can't launch session, module validation failed

i have exactly the same issue.
Nothing in the log except this message :
Error: FlowStep_ResolveSessionCandidates(): Candidate module [59cb1356-4e81-e9da-1f38-2e86d5f63706] failed validation with error: [http_error_502:valkyrie-cook-api.prod.ucs.on.epicgames.com]
Worked perfectly yesterday and today i can’t launch a session…

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