Can’t play online with gold subscription I purchased

I purchase a Xbox live gold subscription for 12 Months

And i played online with it(I think on the begginig of March),but some days later i can’t play online again!

It appears to me i can pick up the games and play the Xbox one games FROM gold,but i don’t can play online

Try removing/reloading your profile to see if that resolves the issue. If that doesn't work try performing a hard reset EXACTLY like this. Hold the power button on the console for 8 seconds or until the power shuts down completely. Unplug the power cord
from the back of the console for 5 minutes. Plug the power cord back in and restart the console.

You need to purchase a gold subscription. A gold subscription is required to play online multiplayer.

A gold subscription is required to play online. You will need to purchase gold in order to play.

A gold membership is required to play online. You'll need to purchase a gold subscription.