"Shorten URL" function isn't working

[PaulFrame-85]

What page is this happening on
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https://ga-dev-tools.google/ga4/campaign-url-builder/
Describe the bug
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To Reproduce
Steps to reproduce the behavior:

1. Go to https://ga-dev-tools.google/ga4/campaign-url-builder/ .
2. Create a tracking link using the tool builder
3. Click on "Shorten URL"
4. See error when the shortened URL does not appear.

Expected behavior
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Screenshots
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Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
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