In the Parter Centre, I’m trying to add the Windows Developer Program to the Programs my organisation is enrolled in. I have to log in again with my personal account which goes OK, I’m presented with a list of programs which I’m already enrolled in and may join, at the bottom of which is a further list under the title ‘Other areas’, which includes Windows app developer, but says ‘To enrol in one of the following programs Sign in again using your personal account.’
I sign in again but get an internal server error message
“Value cannot be null. (parameter ‘key’)rnrn”
The only way out of this is going back. When I do, I’m advised to close all browser windows and retry. I do and this time the sign-in works, but takes me back to the original page which invites me to sign in again.
The error is repeatable; if I had the patience I think I could go around the loop indefinitely. I have tried a different browser, no change. I cannot find any help articles or any way of raising a support ticket with Microsoft.
Can anyone help – I have an application I’d like to submit to the MS App Store, but no way of proceeding!

​In the Parter Centre, I’m trying to add the Windows Developer Program to the Programs my organisation is enrolled in. I have to log in again with my personal account which goes OK, I’m presented with a list of programs which I’m already enrolled in and may join, at the bottom of which is a further list under the title ‘Other areas’, which includes Windows app developer, but says ‘To enrol in one of the following programs Sign in again using your personal account.’I sign in again but get an internal server error message”Value cannot be null. (parameter ‘key’)rnrn”The only way out of this is going back. When I do, I’m advised to close all browser windows and retry. I do and this time the sign-in works, but takes me back to the original page which invites me to sign in again.The error is repeatable; if I had the patience I think I could go around the loop indefinitely. I have tried a different browser, no change. I cannot find any help articles or any way of raising a support ticket with Microsoft.Can anyone help – I have an application I’d like to submit to the MS App Store, but no way of proceeding!   Read More

​