After spending a lot of time and energy trying to add a new Marcus account to Quicken and have Quicken connect to it, I found out that Marcus no longer supports Quicken connectivity. I have existing accounts that do still connect but it is through Express Web Connect and NOT Express Web Connect +. I tried to "bootstrap" it by Resetting one of the accounts that worked in hope that it would pull up the other accounts too, but that just resulted in me disabling the account that I was using to bootstrap with.