Fix (sign up): show proper error message for validation (#2769)

* Fix (sign up): show proper error message for validation

Author: ygrik

src/services/mapiClient.ts

@@ -209,9 +209,14 @@ export class MapiClient {
     }
 
     private createMapiError(statusCode: number, url: string, getError: () => any): any {
+        let error;
         switch (statusCode) {
             case 400:
-                return getError();
+                error = getError();
+                if (error?.code && error.message) {
+                    return new MapiError(error.code, error.message, error.details);
+                }
+                return error;
 
             case 401:
                 this.authenticator.clearAccessToken();