Add the name attribute with the value indoor-outdoor to both radio buttons

<label><input id="indoor" type="radio" name="indoor-outdoor"> Indoor</label>
<label><input id="outdoor" type="radio" name="indoor-outdoor"> Outdoor</label>

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<label><input id="indoor" type="radio" name="indoor-outdoor"> Indoor</label>
<label><input id="outdoor" type="radio" name="indoor-outdoor"> Outdoor</label>

Welcome to FFC forum. The above code is correct, maybe you have issue in the other part of your code or browser issue. Clear your browser cache or Change your browser and try again.
@Lakshmankumarnaik