show a better message when admission to an onboarding meeting succeeds but registration fails

src/components/MembersList.vue

@@ -392,6 +392,7 @@ export default class MembersList extends Vue {
           did: member.did,
           name: member.name,
         }
+        try {
           const result = await register(
             this.activeDid,
             this.apiServer,
@@ -414,17 +415,21 @@ export default class MembersList extends Vue {
               3000,
             );
           } else {
-          const additionalInfo = result.error || "";
+            throw result;
+          }
+        // eslint-disable-next-line @typescript-eslint/no-explicit-any
+        } catch (error: any) {
+          // registration failure is likely explained by a message from the server
+          const additionalInfo = serverMessageForUser(error) || error?.error || "";
           this.$notify(
             {
               group: "alert",
-              type: "danger",
+              type: "warning",
               title: "Registration failed",
-              text:
+              text: "They were admitted to the meeting. However, registration failed. You can register them from the contacts screen. " +
-                "They were admitted, but registration failed. You can try again, or register from your contacts screen. " +
                 additionalInfo,
             },
-            10000,
+            12000,
           );
         }
       }