Reprogram key won't enter mode (indicator flash)

Hey everyone, I've just replaced the battery in the car. I'm now trying to get the car to start, which it won't. The key opens the doors from the fobs, and all lights are working. I enter the programming mode with the 6 on offs and wait 2 seconds. I do not get the indicator flash to engage programming mode. Any suggestions would be welcome. Thanks.
 
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