awaiting sendEmail hangs when sending lots of emails

[Jon-Salmon]

• Package Name: @azure/communication-email
• Package Version: 1.0.0
• Operating system: Windows
• nodejs
  • version: 20
• browser
  • name/version:
• typescript
  • version: 5.6.3
• Is the bug related to documentation in
  • README.md
  • source code documentation
  • SDK API docs on https://learn.microsoft.com

Describe the bug
When sending lots of emails using the approach documented in the examples from within azure functions, the sendEmail function will never return a completed promise in some situations. I think this may be when hitting the account email sending limit, but it will block for eternity. I would expect it to throw an error in that situation.

To Reproduce

for (let i = 0; i < 100; i++) {
  console.log("Sending email: " + i);
  const poller = await client.beginSend(emailMessage);
  console.log("Waiting for email completion");
  await poller.pollUntilDone();
}

Additional context
This may be related to this other issue #25915 ?