I have read many blogs and relevant posts on forums, but I still don't know what to modify or how to solve this problem. I'm extremely anxious now
Guideline 2.1 - Information Needed
We have started the review of your app, but we are not able to continue because we cannot locate the in-app purchases, such as 年会员 and 月会员, within your app at this time.
Next Steps
To help us proceed with the review of your app, please reply to this message providing the steps for locating the in-app purchases in your app.
Note that in-app purchases are reviewed in an Apple-provided sandbox environment. Make sure they have been appropriately configured for review in the Apple-provided sandbox environment.
If you are restricting access to in-app purchases based on factors such as storefront or device configurations, please include this information in your reply along with steps to enable the in-app purchases for our review.
Additionally, note that the Account Holder must accept the Paid Apps Agreement in the Business section of App Store Connect before paid in-app purchases will function.
Resources
Learn more about offering in-app purchases.
Learn more about testing in sandbox.
Topic:
App Store Distribution & Marketing
SubTopic:
App Store Connect