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Hi @woxe,
Welcome to TPG Community!
What device are you using to configure or connect your Chromecast to the WiFi network of the TP-Link? Have you tried to forget the previous network saved on it, then reconnect to the new network? If not, please try it first.
Also, did you receive any error message? Are you able to share a screenshot for us to analyze?
Regards,
BasilDV