I'll check when I get back to my laptop, but I don't think it'll repeat, since I already checked in and flew.

I had to go through the link provided on my 'time to check in for your upcoming flight' email. Once I was into the reservation through the checkin link, there was a second link that popped up asking me to complete the contract tracing form. That was the link that successfully went to the form.

I have an expiring trip credit I need to use and may fly again next weekend. If I do and it happens again, I'll make note of the link.