diff --git a/src/app/features/config/config-form/config-form.component.ts b/src/app/features/config/config-form/config-form.component.ts
index 3ce30d559d..503b023b11 100644
--- a/src/app/features/config/config-form/config-form.component.ts
+++ b/src/app/features/config/config-form/config-form.component.ts
@@ -48,13 +48,19 @@ export class ConfigFormComponent {
       throw new Error('No config for ' + this.sectionKey());
     }
     this.config = cfg;
+
+    // Mark all fields as touched to show validation errors
+    this.form.markAllAsTouched();
+
     if (this.form.valid) {
       this.save.emit({
         sectionKey: exists(this.sectionKey()),
         config: this.config,
       });
     } else {
+      // Update validity to ensure error messages are shown
       this.form.updateValueAndValidity();
+      console.warn('Form is invalid, not saving config:', this.form.errors);
     }
   }
 }
diff --git a/src/app/features/project/dialogs/create-project/dialog-create-project.component.ts b/src/app/features/project/dialogs/create-project/dialog-create-project.component.ts
index d3466639d4..080bacbdd4 100644
--- a/src/app/features/project/dialogs/create-project/dialog-create-project.component.ts
+++ b/src/app/features/project/dialogs/create-project/dialog-create-project.component.ts
@@ -133,6 +133,18 @@ export class DialogCreateProjectComponent implements OnInit, OnDestroy {
   }
 
   submit(): void {
+    // Check if both forms are valid
+    if (!this.formBasic.valid || !this.formTheme.valid) {
+      // Mark all fields as touched to show validation errors
+      this.formBasic.markAllAsTouched();
+      this.formTheme.markAllAsTouched();
+      console.warn('Form validation failed', {
+        basicFormErrors: this.formBasic.errors,
+        themeFormErrors: this.formTheme.errors,
+      });
+      return;
+    }
+
     const projectDataToSave: Project | Partial<Project> = {
       ...this.projectData,
     };
diff --git a/src/app/features/task-repeat-cfg/dialog-edit-task-repeat-cfg/dialog-edit-task-repeat-cfg.component.ts b/src/app/features/task-repeat-cfg/dialog-edit-task-repeat-cfg/dialog-edit-task-repeat-cfg.component.ts
index ba63816f48..1ef11aefc2 100644
--- a/src/app/features/task-repeat-cfg/dialog-edit-task-repeat-cfg/dialog-edit-task-repeat-cfg.component.ts
+++ b/src/app/features/task-repeat-cfg/dialog-edit-task-repeat-cfg/dialog-edit-task-repeat-cfg.component.ts
@@ -187,6 +187,18 @@ export class DialogEditTaskRepeatCfgComponent implements OnInit, OnDestroy {
   }
 
   save(): void {
+    // Check if both forms are valid
+    if (!this.formGroup1.valid || !this.formGroup2.valid) {
+      // Mark all fields as touched to show validation errors
+      this.formGroup1.markAllAsTouched();
+      this.formGroup2.markAllAsTouched();
+      console.warn('Form validation failed', {
+        form1Errors: this.formGroup1.errors,
+        form2Errors: this.formGroup2.errors,
+      });
+      return;
+    }
+
     // workaround for formly not always updating hidden fields correctly (in time??)
     if (this.repeatCfg.quickSetting !== 'CUSTOM') {
       const updatesForQuickSetting = getQuickSettingUpdates(this.repeatCfg.quickSetting);
diff --git a/src/app/imex/sync/dialog-sync-initial-cfg/dialog-sync-initial-cfg.component.ts b/src/app/imex/sync/dialog-sync-initial-cfg/dialog-sync-initial-cfg.component.ts
index e64e1f10e5..462ed2fc5b 100644
--- a/src/app/imex/sync/dialog-sync-initial-cfg/dialog-sync-initial-cfg.component.ts
+++ b/src/app/imex/sync/dialog-sync-initial-cfg/dialog-sync-initial-cfg.component.ts
@@ -78,6 +78,14 @@ export class DialogSyncInitialCfgComponent {
   }
 
   async save(): Promise<void> {
+    // Check if form is valid
+    if (!this.form.valid) {
+      // Mark all fields as touched to show validation errors
+      this.form.markAllAsTouched();
+      console.warn('Sync form validation failed', this.form.errors);
+      return;
+    }
+
     await this.syncConfigService.updateSettingsFromForm(
       {
         ...this._tmpUpdatedCfg,
diff --git a/src/app/ui/formly-config.module.ts b/src/app/ui/formly-config.module.ts
index 354013f8f0..adf184cad0 100644
--- a/src/app/ui/formly-config.module.ts
+++ b/src/app/ui/formly-config.module.ts
@@ -28,7 +28,14 @@ import { FormlyBtnComponent } from './formly-button/formly-btn.component';
     FormlyMatSliderModule,
     ReactiveFormsModule,
     FormlyModule.forRoot({
-      validationMessages: [{ name: 'pattern', message: 'Invalid input' }],
+      validationMessages: [
+        { name: 'pattern', message: 'Invalid input' },
+        { name: 'required', message: 'This field is required' },
+        { name: 'min', message: 'Value is too low' },
+        { name: 'max', message: 'Value is too high' },
+        { name: 'minLength', message: 'Value is too short' },
+        { name: 'maxLength', message: 'Value is too long' },
+      ],
       types: [
         { name: 'link', component: FormlyLinkWidgetComponent },
         {
@@ -76,6 +83,14 @@ import { FormlyBtnComponent } from './formly-button/formly-btn.component';
       ],
       extras: {
         immutable: true,
+        // Show errors when field is touched or form is submitted
+        showError: (field) => {
+          return !!(
+            field.formControl &&
+            field.formControl.invalid &&
+            (field.formControl.touched || field.options?.parentForm?.submitted)
+          );
+        },
       },
     }),
     FormlyMatToggleModule,