Thanks for the follow up, Maurice. It seems that Malwarebytes hasn't been detecting anything new.
However, the Malware bytes extension is detecting something, I've attached a screenshot of this. It seems to be the same thing that was triggering the pop-up. I disabled the Malwarebytes extension to see what happened and the pop-up (the reason for my original post) reappears. Seems like that loungesrc.net isn't being removed?
I've done what you mentioned. I've attached the Microsoft Safety Scanner Report, the recent Malwarebytes report and the screenshot showing how the Malwarebytes Chrome extension is detecting loungesrc.net and flagging it as malicious (I believe).
Malwarebytes report.txt
msert.log