Session is null at login only on deployed server

Does anyone have a solution to this issue where the session is null after logging in only when the server is deployed?

Using fastify and nextjs
Hello everyone,

Unfortunately, my authentication only works on localhost and not in production or the deployed development environment.
We have multiple frontends. Central authentication runs via an Express API (api-ts.playin.gg).
The test frontend for authentication is auth.playin.gg.

Signing in via Google works; you are redirected to /protec...
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