Hello any one knows about that

Generally no it doesn't cause any problems, you can do it. However, there are a few considerations to keep in mind to ensure everything runs normally.

Posted by: @husein

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Generally no it doesn't cause any problems, you can do it. However, there are a few considerations to keep in mind to ensure everything runs normally

Which may not be easy depending on the main site. Make sure you watch many videos on the subject of using a sub-domain for WordPress.

@ssadvisor Yes true, he should do some research before applying it. However, if applied correctly it won't cause problems.

@dedegemoyyy you could use WordPress as the main site code and then incorporate the "Chat Only" code into a WordPress plugin. Or use a wordpress page and do some trickery with the page content editor.