Hi zillurrehman123,
We appreciate you reaching out to us.
We’d like to gather additional details that may help us be in a better position to assist you.
- Is your device on silent mode or Do Not Disturb?
- Can you find the request in the Notification Center?
As mentioned in the article below, "if you miss an Ask to Buy notification, you can find the request in Messages on your iPhone, iPad, iPod touch, Apple Watch, or Mac. If you don't see the request in Messages, you can find your Ask to Buy request in Notification Center."
You can use the article below as a reference.
Approve what kids buy with Ask to Buy - Apple Support
If you answer no to both our questions, please check for a software update and make sure that you are running the latest version of iOS.
While it isn't inherently assured that an update will resolve the issue, updating to the latest software version for your device can help isolate potential software issues.
Kindly secure a backup and update.
- How to back up your iPhone, iPad, and iPod touch
- Update your iPhone, iPad, or iPod touch
Take care!