I can't hear anyone when people speak

Hmm, it could be that there is an issue with Razer Synapse. Sometimes the older version of the driver causes issues with Overwatch.

I know you’re not crashing, but these steps might help:

Additionally, can you add a DxDiag here?

  1. Press Windows Key + R, then type DxDiag and press Enter.
  2. In the DxDiag window, click Save All Information.
  3. Name the file dxdiag and click Save.

To add it to your reply here:

  1. Open the text file and copy all the text.
  2. Paste the text in your reply.
  3. Highlight the pasted text and click </> on the post editor.

If your DxDiag does not fit in one message, DO NOT shorten it. Instead, post it on Pastebin.com and provide the link to it, or the hash code (the numbers/letters after the .com) in your reply.