I was having the same issue with all webview components coming back as a white screen. My solution was replacing my zeroSSL certificate with a trusted LetsEncrypt certificate on my webserver itself... For me the problem was that the cert was not trusted by the root authority.
smzero
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
From
Grass Valley, CA