HOW TO GET FREE MAKEUP EVERY MONTH ON INFLUENSTER TIPS AND TRICKS
Remove all other hashtags except the ones influenster send. Make sure your caption ends with those hashtags (no text after that). Feels like their Instagram post detection is buggy. The above steps helped mine go through.
Disconnect and Reconnect your Instagram account from the Influenster app. This will solve the Influenster instagram rejected problem.