Hello, ajitsahi. Thank you for posting your question to the Apple Support Communities. We understand your situation and how you would like to be sure that Ask to Buy is working normally with your family. We’re happy to help you look into this.
We’re glad to see that you were already able to review the Apple Support article that explains how you can set up and start using the Ask to Buy features with Family Sharing.
To help you continue from here, we’d like to provide you with another Apple Support article. This article explains which steps you can take if you are noticing that Ask to Buy is not working as expected:
If Ask to Buy isn't working - Apple Support
The article above can help you check to be sure that your Family Sharing settings are enabled correctly, and that your family is using compatible devices. We’d suggest completing each step in the order that they are listed in the article.
We hope that this answer helps you gain access to the Ask to Buy features of Family Sharing. Please let us know if you have any other questions about this.
Cheers!