Hi Robertw1234,
It appears you created your post from the support article If your AirPods or AirPods Pro won't connect which outlines the best steps to take if an AirPod is not pairing. Were you able to complete all of those steps?
A few callouts to check are that the AirPod in question shows that it is charged using on-device widgets or in the animation when the case is opened and AirPods are inserted.
How to reset your AirPods and AirPods Pro is another recommended step to address pairing issues.
Barring those, contact Apple Support if the steps did not remedy the problem to explore further options.
Regards.