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Are you using the wifi router supplied by TPG? The wifi network name and password shoud be on a label on the router.
Are you selecting the right network on the Chromecast?
Hi @Leaders11,
Welcome to the community!
We did an articles that you may find helpful, this will guide you on how to retrieve the Wireless Password to connect your device(s).
See links below.
Should you need further assistance, feel free to search community for help or chat with us at https://www.tpg.com.au/support/contact/ and we'd be glad to assist you.
Regards,