When to use it
Use it when you missed something because of audio problems, crosstalk, or a fast speaker. Asking for a repeat is normal; putting yourself down while you do it is what makes it awkward. “I want to get it right” gives a good reason for asking.
Example
Client: “…so we'd need it by the twelfth, with the revised totals.”
You: “Can you say that last part again? I want to get it right.”
Client: “Revised totals by the twelfth.”
In an email or Slack message
After a call, confirm in writing: “Just to confirm what I heard: revised totals by the 12th. Let me know if I missed anything.” A written recap catches anything the repeat didn't.