I have 101 Rep on meta.stackoverflow.com however, my account on chat.meta.stackoverflow.com shows me as having 1 rep. As a result I am unable to use chat. As I understand it the rep should be identical between the two.
Has your rep changed very recently (maybe due to creating a new meta account and associating them)?
The rep is cached for about an hour, but to kick it: try navigating to here.
If that doesn't work, I have other tricks... let me know.