If your original characters was created on Stadia (as you mention in your post), unlinking Cross Save [u]for any reason will result in permanently losing your current characters, triumphs and progress. [/u] In your scenario, there is nothing that can be done since Stadia doesn't exist for platform authentication. [url]https://help.bungie.net/hc/en-us/articles/10347044092564-Save-Your-Stadia-Characters[/url]