Docusign SignHere tab not showing when Documents are sent through a Laravel app

I am working on a Laravel application where I have integrated DocuSign for sending documents for electronic signatures. I followed the official DocuSign API documentation to set up JWT authentication and successfully send documents. However, when I send a document for signing, the signature field does not appear on the document.

As I mentioned, I successfully send the documents and the code for building the envelope is the following:

public function buildEnvelope(Request $request): EnvelopeDefinition
{
$fileContent = $request->file('formFile')->get();
$fileName = $request->file('formFile')->getClientOriginalName();
$fileExtension = $request->file('formFile')->getClientOriginalExtension();
$recipientEmail = $request['email'];
$recipientName = $request['name'];

$document = new Document([
'document_id' => "1",
'document_base64' => base64_encode($fileContent),
'file_extension' => $fileExtension,
'name' => $fileName
]);

$sign_here_tab = new SignHere([
'anchor_string' => "**signature**",
'page_number' => "1",
'anchor_units' => "pixels",
'anchor_x_offset' => "100",
'anchor_y_offset' => "300"
]);

$tabs = new Tabs([
'sign_here_tabs' => [$sign_here_tab]
]);

$signer = new Signer([
'email' => $recipientEmail,
'name' => $recipientName,
'recipient_id' => "1",
'tabs' => $tabs
]);

$recipients = new Recipients([
'signers' => [$signer]
]);

$inlineTemplate = new InlineTemplate([
'recipients' => $recipients,
'sequence' => "1"
]);

$compositeTemplate = new CompositeTemplate([
'composite_template_id' => "1",
'document' => $document,
'inline_templates' => [$inlineTemplate]
]);

return new EnvelopeDefinition([
'composite_templates' => [$compositeTemplate],
'email_subject' => "Please sign",
'status' => "sent"
]);
}


I have specified the page number, some random coordinates, anchor string, and anchor units and expected that on page 1 somwhere I'd see the text signature

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