Make sure that you've completed all the following steps and checks before you start bidding:
Make sure you wait for the partner and Audience Network SDKs to finish initializing before sending a bid request. Not doing so can cause Bid Requests to be malformed when received by Audience Network, and appear as an Unknown platform in your dashboard (so they won't be filled).
setAdvertiserTrackingEnabled
flag (Audience Network | Facebook) - you'll need to set it for both the Audience Network SDK and Facebook SDK if you are using both SDKs.SKAdNetwork IDs
to your config file (Audience Network).