DUO Won't Allow "Remember me for 30 days" to be Enabled. (Safari)

Instructions for enabling the ability to "remember me for 30 days" on DUO for Safari

1. Open Safari.
2. Click "Safari" at the top left in the menu bar.
3. Click Preferences.
4. Click Privacy.
5. Uncheck "Block All Cookies" or set to Never.
6. Uncheck "Prevent cross-site tracking" option.
7. Try checking "Remember me for 30 days" and the error should not appear.