Check your FERS tier and how solves run on this server: member limits, licence state and where results come from. With sandbox_token: true, a Pro account also gets a solve token for 15 minutes, for a code sandbox that cannot reach ferscloud.com: set it as FERS_SOLVE_TOKEN there (or run_analysis(solve_token=...), FERS 0.2.0+) to solve beyond 100 members. It sits in the transcript, so ask only when a model needs it.