You’re using the name attribute in your a tag, try this instead:

<a href="#isi2"></a> to -> <a name="isi2" id="isi2"></a>

I have an anchor tag in one part of the page that is meant to jump to another section within the email body.
Somehow the anchor tag isn’t functioning as it is on desktop and the email in a mobile browser.

<a href="isi2></a> isn’t jumping to this ->
<a name="isi2"></a>

I’ve copied and pasted the HTML below to provide more context.

            <td>
              <a href="#isi2">
              <img
                alt=""
                style="
                  border: 0;
                  display: block;
                  width: 100%;
                  height: auto;
                "
                src="#"
              />
            </a>
          </td>

     <tr>
    <td width="640" height="auto" bgcolor="#ededed">
      <a name="isi2"></a>
      <img
        alt=""
        style="border: 0; display: block; width: 100%; height: auto;"
        src="#"
      />
    </td>
  </tr>