Thanks for reaching out, Mark. I was able to pull up your chat transcript you had on the 19th, as well as review the assignment in your WileyPLUS / Canvas integration. There doesn't seem to be anything wrong on the WileyPLUS end--I would recommend reaching out to your instructor to have them delete and remake the link to the WileyPLUS assignment. (No one in your class has accessed the test, so I would imagine it is a Canvas issue.)
I've taken ownership of your support case (00953028), so you can reply here or to the email I'm about to send you.
Tom with Wiley