Billing grace period just never gets enabled

Hello,



I have been trying to helplessly enable the billing grace period new functionality by trying to turn it on, but it just goes loading forever.


Image :

https://www.dropbox.com/s/bg2lhnc2zi0wqag/Screen%20Shot%202019-09-14%20at%207.24.10%20PM.png?dl=0


AppID 545395155



Can you help ?



Regards,