When the disneyplus.com/begin 8 digit code is not working, the issue could be it has expired. The code can also fail to authenticate if you use an incompatible device. Furthermore, you may experience the issue if your internet service is not working or if Disney is having issues on its end.
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Disconnect your mobile or Wi-Fi internet connection from the device you're using, wait for 30 to 60 seconds, and then reconnect. Sometimes all you need is to refresh your connection. Reset your Wi-Fi modem. Check for any updates that may be available for the app.
Regards,
Diana