"[404] [NotFoundError] Avatar not found" when allowing players to recustomize their avatars

I have been using the RPM WebView to prototype a new mobile game for iOS/Android. It has worked very nicely so far…

Recently have implemented the ability for players to re-customize their avatars whenever they would like. This obviously opens up the WebView, and when player is done customizing they can tap ‘Next’ and the new avatar URL is saved.

However, sometimes when the user taps ‘Next’ to finalize the avatar, nothing happens. The WebView is meant to return the new avatar URL (and subsequently close), but that doesn’t happen in some cases.

Looking at Android Logcat on Unity, I can see some errors arising:

I really want to push this out to testers as soon as I can. So, any help to resolve this issue would be much appreciated. Thanks.