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A short description of the issue:

My add-on creates a card that pulls a phone number from a Google Sheet. I've created a newTextParagraph that includes a standard HTML tel: link to turn the phone number into a clickable link actionable in Windows. The link doesn't show, just the text.

A small code sample that reliably reproduces the issue. The sample should run as-is or with minimal setup, without external dependencies.

function testCard(){
  let pNumber = '123456789';
  let text = CardService.newTextParagraph()
  .setText('<a href ="tel:' + pNumber + '">' + pNumber + '</a>');
  let section = CardService.newCardSection()
  .addWidget(text);
  let card = CardService.newCardBuilder()
  .addSection(section);
  return card.build();
}

What steps will reproduce the problem?

1. Call the above script
2. Click on the text "123456789'
3. Nothing happens

What is the expected output? What do you see instead? If you see error messages, please provide them.

This is the same syntax as an html <a href = "tel:123456789"> 123456789 </a>. This is fine in normal HTML but it isn't rendering correctly in cardService.

Please provide any additional information below.

N/A