For reference, here is the Steam Guide I was following last night.
As of last night’s stream, I have not yet completed Siblings in the main story.
Note also that only two white shield side quests had appeared.
I tried to find a blue shield before completing any white shield mission, but it did not show even after 6 sleeps and days.
I completed the two white shield side quests, but then no more appeared and a blue shield mission still did not appear.
So, I worked on agility and power level side challenges. After a bunch of time, no shields appeared.
I will try again on Thursday.
You can watch my attempt from last night here.
Come back tomorrow at 8am Eastern to see if anything changes!