Yii2 Advanced app, different session for frontend and backend with subdomains - session

Question

I have a problem with my Yii2 app.
I have a advanced-app with frontend and backend parts on different domains (subdomain). I use webvimark user management module, but I think the problem is not in it.
Frontend app -> domain.com
Backend app -> admin.domain.com
So I have problem with login in backend, it is not working.
I enter login and password, and after submit form I see login form again.
'user' => [
'identityClass' => 'webvimark\modules\UserManagement\models\User',
'enableAutoLogin' => true,
'identityCookie' => [
'name' => '_backendIdentity',
'domain' => 'admin.domain.com',
],
'class' => 'webvimark\modules\UserManagement\components\UserConfig',
],
and
'session' => [
'name' => 'BACKENDSESSID',
'cookieParams' => [
'domain' => 'admin.domain.com',
],
],
Any ideas?
Update #1: My config located: /backend/config/main.php
Update #2: There was a problem when transferring backend on a subdomain

Answer 1

Okey, there was a problem with the configuration of the module, as well as the wrong config in the frontend.
Backend:
'user' => [
'identityClass' => 'webvimark\modules\UserManagement\models\User',
'enableAutoLogin' => true,
'identityCookie' => [
'name' => '_backendIdentity',
'domain' => 'backend.test.dev',
],
'class' => 'webvimark\modules\UserManagement\components\UserConfig',
'on afterLogin' => function ($event) {
\webvimark\modules\UserManagement\models\UserVisitLog::newVisitor($event->identity->id);
},
],
'session' => [
'name' => 'BACKENDSESSID',
'cookieParams' => [
'domain' => 'backend.test.dev',
],
],
Frontend:
'user' => [
'identityClass' => 'webvimark\modules\UserManagement\models\User',
'enableAutoLogin' => true,
'identityCookie' => [
'name' => '_frontendIdentity',
'path' => '/',
],
'class' => 'webvimark\modules\UserManagement\components\UserConfig',
'on afterLogin' => function ($event) {
\webvimark\modules\UserManagement\models\UserVisitLog::newVisitor($event->identity->id);
}
],
'session' => [
'name' => 'FRONTENDSESSID',
'cookieParams' => [
'path' => '/',
],
],