Hello, good day and thanks for your question. You might need to change the way you search as the system might be looking for variety instead of doing the same searches and there is also a possibility that your account is on a search cooldown. Please refer to the below for the other things that you can check.
Ensure that you are not using or connecting to VPN or proxy.
Logout and login to your account.
Check and try the dashboard on a browser if you are using the Bing app or vice versa.
Check and try on a different browser as well.
Another thing that you can check and try is to use InPrivate browsing or Incognito mode on whichever browser you are using.
In the event that you will still encounter an issue after checking the above and if it will still be the same later today or tomorrow, you may submit a ticket via https://rewards.bing.com/support for this to get checked internally by the rewards team. Response times may vary due to workload or other tasks at hand, but rest assured that they will review your case and let you know on the outcome.