Q:

How to change the availability of territories of a released iOS app in Apple app store

We are trying to change the availability of  territories of a released iOS app in Apple app store
Unfortunately, a bug of iTunes connect prevent us from changing availability.
And we got a JS error on the page

A:

May be helpful:
As per apple documentation:

Only users with the Admin, Technical, or App Manager role can access
  the Pricing and Availability section to make changes. Users with the
  Marketer role can access this section but cannot make changes.

