Hello @RshPO1122 and welcome to the Community. This Help Article has a section that might help you. I might be wrong, but it sounds like you are trying to set up your scale, not connect it to a new network. Jump to the connect to wi-fi section.
Laurie | Maryland
Sense 2, Luxe, Aria 2 | iOS | Mac OS
Take a look at the Fitbit help site for further assistance and information.
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