Avatar SDK menu open suddenly stopped working....?

I have several apps using the Meta Avatar SDK v35.1. 

We render users as full body avatars and offer a button that opens the avatar customization menu in the app. The button runs this line:

AvatarEditorUtils.LaunchAvatarEditor();

This has been working well and then suddenly some time recently it just stopped doing anything. It now seems to be a total no op. 

Has anyone else experienced this? Why is this command not working anymore?