It sounds like you didn't open your RoI book until after you finished the campaign. If doing the scan patrol mission doesn't move it forward, then your only option is to play through it on your own or as fireteam leader, in order, to see if you can get it to catch up. Make sure you play the missions at their base level and not a harder version.
Good luck.
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This has been tried. Also, the Quest line being bugged is not about any particular element. As for the ROI book, it was opened day 1 of release. All my books were. So that isn't the source of the issue.