I Go to claim reward section show me claim disabled at the moment...why?

you can claim in v2 of the app which is now live on the play store, App Store coming shortly. Please read this medium article fully which explains everything https://legionnetwork.medium.com/legion-super-app-v2-launches-be4bea482a27

The Claim Rewards button is currently disabled for all users. As long as you have the Approved badge next to your name, you're safe.