How to make a 1C-Bitrix test machine on a subdomain?

Question

1C-Bitrix

Good afternoon. There is a task to create a copy of the virtual machine and the site itself on Bitrix in the test subdomain.
In the domain name settings, the test subdomain was redirected to another IP.
On the test domain, I restored the site through system restore. And now authorization fails on the site in the test subdomain and I can't save anything. In the settings, a domain without a subdomain is specified everywhere. And kukki refer to the main domain.
How can I fix it so that the session does not crash at the test domain?

Answer 1

Specify a subdomain in the Bitrix admin panel and clear cookies.