Protected Audience API is available at both webView & chrome.
that had been verified using https://developers.google.com/privacy-sandbox/relevance/protected-audience-api#detect_feature_support

However, with an Interest Group joined from Chrome browser, that IG was not available at the Protected Audience Auction
triggered within WebView.

This is essential to resolve since our business has Ads displayed on WebView where Auctions are required to run.