I bought a license and installed it on the website. Activated the license. Everything was working. Then on the subdomain https://test .visible.rf/ decided to check another template. The documentation says that it is on a subdomain of test. You can test the theme and other designs. But after that, on the template registration page there is an inscription "Checking purchase code..."

The problem is solved. The subject was translated in the translation file, so it didn't work. The title of the topic was returned in translation, everything worked.