Cannot change Test Merchant Locale on Mission control

I tried to change the locale on one of our test merchants (both in and but the merchant locale doesn’t change.

I noticed that after save, for a second or two, the page display the locale IT, but it changes back immediately.

I tried to modify the currency on test store, re-install and re-confgure both the emulator and the physical device, but without result: the currency sent is ixed to USD (and on the platform I cannot change the currency of the plans)