my app has been rejected

Have you provided all information about rejection message ? Usually, they tell a bit more.

It is difficult to give precise answer as you don't tell anything about your app. However:

There is no such 1.5.0, just 1.5. Is it what they refer to ?

People need to know how to reach you with questions and support issues. Make sure your app and its Support URL include an easy way to contact you; this is particularly important for apps that may be used in the classroom. Failure to include accurate and up-to-date contact information not only frustrates customers, but may violate the law in some countries or regions. Also ensure that Wallet passes include valid contact information from the issuer and are signed with a dedicated certificate assigned to the brand or trademark owner of the pass.

So, check your contact information in app submission (meta data).

Similarly, 4.2.0 does not exist. 4.2 is a general requirement that your app must make value of iOS specific capabilities. In such, an app that could be similar as w web app will not be accepted.

Your app should include features, content, and UI that elevate it beyond a repackaged website. If your app is not particularly useful, unique, or “app-like,” it doesn’t belong on the App Store. If your App doesn’t provide some sort of lasting entertainment value or adequate utility, it may not be accepted. Apps that are simply a song or movie should be submitted to the iTunes Store. Apps that are simply a book or game guide should be submitted to the Apple Books Store.

Here is the full App Review (since my app is not App Store yet I don't know how to share it in Forum): Guideline 1.5 - Safety - Developer Information

The support URL specified in your app’s metadata, https://sites.google.com/view/tnved-email/home, does not properly navigate to the intended destination.

Next Steps

To resolve this issue, please revise your app’s support URL to ensure it directs users to a webpage with support information.

Guideline 4.2 - Design - Minimum Functionality

We found that the usefulness of your app is limited by the minimal amount of content or features it includes.

Next Steps

We encourage you to review your app concept and incorporate different content and features that are in compliance with the App Store Review Guidelines.

We understand that there are no hard and fast rules to define useful or entertaining, but Apple and Apple customers expect apps to provide a really great user experience. Apps should provide valuable utility or entertainment, draw people in by offering compelling capabilities or content, or enable people to do something they couldn't do before or in a way they couldn't do it before.