"Create a Set of Radio Buttons" Code is right, doesn't pass test?

The instructions were clear, no trouble implementing.

The test thinks that I haven’t set the name attributes of the radio buttons to “indoor-outdoor”.

Relevant Code:
    <label>
           <input type="radio" name=:"indoor-outdoor"> Indoor
    </label>
    <label>
          <input type="radio" name=:"indoor-outdoor"> Outdoor
   </label>

Rest of the code:


<h2>CatPhotoApp</h2>
<main>
<p>Click here to view more <a href="#">cat photos</a>.</p>

<a href="#"><img src="https://www.bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>

<p>Things cats love:</p>
<ul>
  <li>cat nip</li>
  <li>laser pointers</li>
  <li>lasagna</li>
</ul>
<p>Top 3 things cats hate:</p>
<ol>
  <li>flea treatment</li>
  <li>thunder</li>
  <li>other cats</li>
</ol>
<form action="https://www.freecatphotoapp.com/submit-cat-photo">
  <input type="text" placeholder="cat photo URL" required>
  
  <label>
  <input type="radio" name=:"indoor-outdoor "> Indoor
  </label>
<label>
  <input type="radio" name=:"indoor-outdoor"> Outdoor
  </label>
  <button type="submit">Submit</button>
</form>

</main>
  **Your browser information:**

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.164 Safari/537.36

Challenge: Create a Set of Radio Buttons

Link to the challenge:

that syntax is wrong.

Compare it to setting the type attribute: