Unlink device: confirmation window does not appear

I have been trying to unlink my ex's Roku 2 device from my account.  I am running Windows 10 and have tried unlinking the device on three different browsers: Chrome, Firefox, and Edge (I cleared the browsers each time), but when I click "Unlink" the confirmation window does not pop up.  Pop-up blockers are off, and Roku is a trusted site on all three browsers.  I tried disconnecting my mouse and using the touchpad on my laptop.  None of these attempts have worked.  Any ideas on how to unlink the device?