Webform "Not You?" message does not appear in secondary theme area
We just set that &quot;Not You?&quot; message using standard drupal message functions (in D7 and D8). A theme will typically display such messages in a separate region above the content region. What you can try is change the Region settings -&gt; i.e. change it from in your case Help -&gt; Secondary.
D8 example - using Olivero Theme: works well: