Hi Areej14
Welcome to the Apple (user-to-user) Community.
Here's the pairing info. for iPadOS 16:
Pair and charge Apple Pencil (1st generation) with iPad – Apple Support
Pair and charge Apple Pencil (2nd generation) with iPad – Apple Support
And
In Apple's article: Connect Apple Pencil with your iPad - Apple Support
If you scroll down, the article says what to do:
"If your Apple Pencil won't pair with your iPad".
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Also:
If you haven't already, you may want to try updating to iPadOS 16.2
About iPadOS 16 Updates - Apple Support
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If needed:
Check iPadPro / pencil compatibility:
2nd generation pencil:
iPad Pro 11-inch (all generations)
iPad Pro 12.9-inch (3rd generation and later)
1st generation pencil:
iPad Pro 9.7-inch
iPad Pro 10.5-inch
iPad Pro 12.9-inch (1st and 2nd generation)
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If you need more Support:
You might want to reach out to the iPad Support Team:
Eg:
There is a "Get Support" link (or an app) at the bottom of their webpage (link below)
iPad - Official Apple Support
All the best :-)