Good day Rory, thanks for your question. I am glad to be able to provide assistance to you today. Are you not earning after sometime after doing the search and the activities for MS Rewards or there is no points given at all? This is most likely due to the recent changes for Microsoft Rewards which includes earning points including the cooldown system which affects activities as well.
https://www.pcworld.com/article/2160414/microso...
https://www.windowscentral.com/software-apps/mi...
https://www.windowscentral.com/software-apps/mi...
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Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.
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Regards,
Paul R.