diff --git a/HMCL/src/main/java/org/jackhuang/hmcl/ui/account/CreateAccountPane.java b/HMCL/src/main/java/org/jackhuang/hmcl/ui/account/CreateAccountPane.java
index 19d6eb52d2..2dc2a32825 100644
--- a/HMCL/src/main/java/org/jackhuang/hmcl/ui/account/CreateAccountPane.java
+++ b/HMCL/src/main/java/org/jackhuang/hmcl/ui/account/CreateAccountPane.java
@@ -460,6 +460,9 @@ public AccountDetailsInputPane(AccountFactory<?> factory, Runnable onAction) {
                 onChangeAndOperate(cboServers.valueProperty(), server -> {
                     this.server = server;
                     linksContainer.getChildren().setAll(createHyperlinks(server));
+
+                    if (txtUsername != null)
+                        txtUsername.validate();
                 });
                 linksContainer.setMinWidth(USE_PREF_SIZE);
 
@@ -590,6 +593,9 @@ private boolean requiresEmailAsUsername() {
             if ((factory instanceof AuthlibInjectorAccountFactory) && this.server != null) {
                 return !server.isNonEmailLogin();
             }
+            if (factory instanceof BoundAuthlibInjectorAccountFactory bound) {
+                return !bound.getServer().isNonEmailLogin();
+            }
             return false;
         }