If you're using blaggos CPU miner,
Navigate to:
C:\Users\USERNAME\AppData\Roaming\BurstWallet\miner-burst-1.160705
and open miner.conf in a text editor such as notepad++ etc.
Check its settings to see what pool and port it's set to.
Also I've seen some pools in the past where:
the address on the web interface doesn't match the actual pool address for the reward assignment
the address given from the drop down list in the AIO wallet doesn't match the pools address for the reward assignment
But that was months ago. These issues may have been fixed in the latest wallet update. As I recall the error message displayed from the miner listed the correct pool address and thats the one you should use when setting the reward assignment. It was months ago that I ran into this type of problem so I'm typing from memory. I believe you can go into the miner.conf, set the pool and port, run the miner and it will tell you what the correct reward assignment address should be for that pool. Try that.