Hi
I uploaded an application generated to testflight with power server 2019 and xcode10.I upload the build version 1.8 on 28/08/2019, that version was accepted and dont sent me a message error but when I uploaded the version 1.9 and 2.0 on 29/08/2019 the App Store Connect sent the next error:
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App Store Connect

Dear Developer,

We identified one or more issues with a recent delivery for your app, "Talk Expenses" 1.0 (2.1). Your delivery was successful, but you may wish to correct the following issues in your next delivery:

ITMS-90809: Deprecated API Usage - Apple will stop accepting submissions of apps that use UIWebView APIs . See https://developer.apple.com/documentation/uikit/uiwebview for more information.

After you’ve corrected the issues, you can use Xcode or Application Loader to upload a new binary to App Store Connect.

Best regards,

The App Store Team
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I investigated the error and what they mention is that

UIWebview is deprecated
https://developer.apple.com/documentation/uikit/uiwebview

and that it is recommended to work with

WKWebView
https://developer.apple.com/documentation/webkit/wkwebview

I don't know if today 29/08/2019 App Store Connect updated that UIWebview is deprecated

thanks for attention,
regards