Why isn't the battry working properly?

Hello, I purchased a replacement battery for my older MacBook Pro 15”. The shape, connections and model number of the battery all match the one that I am replacing. I installed the battery and saw that the power adapter had changed to amber indicating that it was changing and went about my day. BUT, the battery is not working at all and the computer is indicating that it can not charge. I’ve tried everything: resting the RAM, making sure the connections are clean and everything fit well in the computer. And yet, no battery power. I even put the old battery back in to make sure the computer worked properly and it does.

Please advise.