i can not change my android server key under Mobile settings

Hello i regenerate my server key in google developer console now when i want to update that android server key under MOBILE SETTINGS in my backendless management, the server key does not change, i mean i change it and when i go to another section, (messaging for example) and go back the android server key has prevoius value . This is preventing me from sending push notifications.
Could you help me?

My App id: F2DF51F8-ADC0-8CD9-FFB7-288915C50900


this was resolved in another post and the problem was that there was a ‘null’ value in the developer email field. Once removed i was able to save the new key.