Maybe you have not saved your private key?

Still cant claim

i cant find it, so maybe yes i dont have it

Is lgx app really decentralized ???? Why showing ( claim faisable at this moment)?

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