Sorry let me elaborate, If I try to access it via Port 9982 it says Site can't be reached.
I can login and authenticate via port 9981, then if I click Watch TV, it opens a new windows and it gives the screenshot attached.
If I select a channel, I get the Authentication Required (screenshot attached) I try to login using admin credentials, and it just keeps asking to login. Not sure what you mean by play button, unless you're referring to recording. I haven't bothered to test that yet till I'm able to stream.
I've attached updated log file
Edit: I wanted to add, I just added the Kodi Plugin, and used the admin credentials and it's streaming, so I did something write. But can't stream via the web.
TVheadendLog.txt