The logs show it is (TypeError: Object of type LazyStaticAbsoluteUrl is not JSON serializable), and I found this link https://discuss.overhang.io/t/no-activation-email-errors-logged-on-user-sign-up/1969/7 about the same issue. Is there any quick fix or should I upgrade and now that we have few versions afterwards is it safe to upgrade to [v13.0.3] or should I stick to [v12.1.3] so that I don’t loose my courses and theme customization.