homepod mimi it have a issue

Is your Wi-Fi set up with WPA/WPA2 and with any client isolation feature turned off? See If you can’t set up HomePod - Apple Support. Note that:

• HomePod doesn't support public or subscription networks with sign-in requirements. These networks are often in places such as businesses, schools, dorms, apartments, hotels and shops. 

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The homepod will not connect with Cellular only on Wifi.

Make sure that your iPhone is connected via Wifi 2.4 GHz