apple watch store

Hi Abdullah_k_y.

Welcome to the Apple Community. We are all Apple users, like yourself (not Apple itself).

There may be any one of a few different reasons you can not sign in

Apple support have articles online (links below) that may help troubleshoot.

      ✽. There may be a Screen Time setting that restricts purchases :(ie: don't allow / allow)

See this article : Set up Screen Time for yourself on iPhone – Apple Support

      (ie: Check: Settings > ScreenTime > Content and Privacy Restrictions > iTunes & App Store Purchases)

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✽ Your watch / iPhone may need to be logged in with your Apple ID

before you go to the App Store to download free apps or to make purchases

How to: Sign in with your Apple ID

Sign in with your Apple ID - Apple Support

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✽. If this is the first time you are using the App Store or iTunes:

You may need a payment method listed in your Apple ID account for this first time.

Change, add, or remove Apple ID payment methods - Apple Support

Trouble-shooting: f needed:

If you can't open the App Store or iTunes Store, buy content, or edit payment information - Apple Support

Or

If you still need help:

The App Store Support Team has a website online.

(There is a "Get Support" link to contact them, at the very bottom of their webpage.)

App Store - Official Apple Support

All the best :-)