Inapp builling test failed on beta version

I have added new app to my console as beta version for testing and added few users as testers.
I have followed the inapp builling tutorial ..added the key and some products in my console then activated them .

Testers can download the app but the in app builling manager are saing that the user must log in to their google accounts and they can not purchase the inapp product .

Does inapp builling works also when apk is in beta stage ?
Thank you

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