So they will always have Russia. From Russia with love!By her IG Russia was spring 2017, France was summer 2018 (combined with a trip to Italy & Monaco)
Harrow started shooting late summer 2017, Season 2 (where Bianca was in) started shooting autumn 2018. Before that the last time he was in Oz was 2014 for San Andreas.
No way that he was with Bianca already when they were in Moscow, it's possible that he knew her already for the France trip though (he was liking a post of her from early 2018, just dunno when he did that)