I understand you are experiencing issues with your A10 + MixAmp TR. Here are a few steps you can take to attempt to remedy the issues.
Check to make sure each of the cables are seated properly. The inline cable should almost click into place for both the headset and on the MixAmp.
Test out the headset by itself on an alternate device. You can either test it out on a different PC using the included Inline cable on the headset to microphone in and speaker out jacks or you can hook up the headset directly to any smartphone.
If these steps did not alleviate the issues you were experiencing, or if you have narrowed the issue down, please go to the link below and submit a case. Let your agent know all the steps you tried and the outcome of your troubleshooting. It will help speed the resolution of your case!
Support Channel: https://www.astrogaming.com/contact/