Your session was flagged because it came from an IP address this account has never signed in from before.
A flagged session is not restricted in general — you can read everything, and payouts to the account already on file continue normally. The only blocked action is changing payout details, which needs your security answers first.
Common innocent causes: travelling, a new phone or laptop, switching between home and office networks, a VPN, or a mobile network that rotates addresses.
Answer the questions once and that session is cleared. Your first-ever session is never flagged — it is what establishes the known address.
The partner help centre covers attribution, the ledger, payouts and the selling rules.