TestFlight universal 64-bit ANE ?

I pretty much stopped using TestFlight when they stopped Android support, but now I need to enable it for a customer

using the ANE from "Adobe Gaming SDK 1.4" I can compile and test in FlashDevelop just fine, but when I try to package for iOS I get this error :

"Error: META-INF/iPhone-ARM/libTestFlightImpl.a are required to have universal iOS libraries. Please contact the ANE developer(s) to get the same."

I searched and found that all ANEs from the Gaming SDK have a 64-bit version here : Gaming SDK ANEs - Universal 64-bit support | Adobe Developer Connection

...except the "betatesting" (TestFlight) extension

I am missing something ? Can we still package IPAs enabled for TestFlight ? If yes, how ?

Any suggestion welcome !

Thanks