ITMS-90809 Deprecated API Usage - New apps that use UIWebView are no longer accepted

Dear Developer,
We identified one or more issues with a recent delivery for your app, "Txxxx" 19.0 (19.0). Please correct the following issues, then upload again.
ITMS-90809: Deprecated API Usage - New apps that use UIWebView are no longer accepted. Instead, use WKWebView for improved security and reliability. Learn more (https://developer.apple.com/documentation/uikit/uiwebview).
Best regards,
The App Store Team

I got this email and the binär files is not right. Please give me hints.

Thanks, Jörn