I had a couple of May applicant have similar issues and they reattempted the test using the same link a day or 2 later. (The link remains the same for everyone anyways as the link is generic). They just completed the oath last month.its Calgary!
I was visible but my USB-C docking station device was connected to an external desktop which was turned off but I had the citizenship test on my laptop opened. During the test there was a prompt on my first question then I removed it my USB-C docking station and completed the test with results 17 out of 20.
In today's email they mentioned - I cant proceed with additional attempts. Please see below :
As we have invalidated your attempt in our portal, you will no longer have access to the online test for your additional test attempts. IRCC will provide you with a new test invitation that will explain next steps for completing your remaining attempts at the citizenship test.
Not sure how much time it will take for next steps.
I've updated the spreadsheet with your location as Calgary, it was earlier Vancouver based on your earlier message 2 weeks back.