Testflight error https://appstoreconnect.apple.com/iris/v1/builds/* "You cannot update when the value is already set."

I uploaded a new Testflight build. I clicked Missing Compliance "Manage" and answered the questions. The modal closed as usual. I looked in the builds ready for testing and it is empty. I go back to the builds screen and I see that the Missing Compliance "Manage" button has reappeared. I answer the questions again. This time an error message appears "An error has occurred. Try again later.". I open the Javascript Inspector's Network tab and see that the request on https://appstoreconnect.apple.com/iris/v1/builds/* is 409

This is the response from the request:

{
"errors" : [ {
"id" : "123456",
"status" : "409",
"code" : "ENTITY_ERROR.ATTRIBUTE.INVALID",
"title" : "The provided entity includes an attribute with an invalid value",
"detail" : "You cannot update when the value is already set.",
"source" : {
"pointer" : "/data/attributes/usesNonExemptEncryption"
}
} ]
}

I waiting 3 days already and it's the same thing. Appears that when I originally submitted my compliance details, they were not saved. How do I fix this? I've submitted a support ticket.
Have same issue. Did you fix it?
Have you tried adding ITSAppUsesNonExemptEncryption:NO to your iOS target's Info.plist?
For me, this occurred when I provided my app's compliance information on the App Store tab. The Test Flight tab then still required compliance and the error occurred when I tried to complete it again from this tab. From the error "You cannot update when the value is already set." I am assuming the Test Flight tab is somehow not aware that the compliance is already provided.

I was able to fix the error by clearing site data (In Chrome: F12 -> Application -> Clear site data) and logging in again. From here, the Test Flight tab no longer asked for compliance information.
Testflight error https://appstoreconnect.apple.com/iris/v1/builds/* "You cannot update when the value is already set."
 
 
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