That is because Morrocco is not part of the supported countries for iTunes Store:
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You can do that indeed, but you won'tbe able to purchase anything since you need a credit card from the country of your account. You will only be able to download free stuff.
Here's how to set up your account: Create or use your Apple ID without a payment method - Apple Support
Question : i cant my country when i want to do review for itunes acount in my iphone 6s (morrocco)