Why Can't I Trade Yellow Gatherer's Scrips?

[Iscah]

I have completed 5.0 MSQ (the Shadowbringers quest dungeon and trial and have the "Shadowbringer" title which I assume is 'completing' the MSQ as far as this is concerned), I am now a level 80 Botanist and have done 4 of the Mean animal 'product' gathering requests, ie. the Facet of Gathering quest line.

Have you talked to Mowen (ie. not-Rowena) in Eulmore yet?

Have you unlocked the scrip shop in Rhalgr's Reach?