Why am I having trouble integrating my Instagram and Facebook shop?

[Bloodmoonforest]

I have been having a hard time with connecting my instagram to my shop. Every single time I try the Facebook log in pops up for a second and then I get booted to a page highlighted in pink saying " For your account security, logging into Facebook from an embedded browser is disabled. To continue download and log into the Facebook app on your device and try again." 

I AM logged into the Facebook app on my device. 

I would love to know how to do this I see other people with instagram shopping installed and it looks incredible.