Hello Madishetty, Priyanka,
Welcome to the Microsoft Q&A and thank you for posting your questions here.
I understand that you are getting aborted error when using TTS Avatar synthesis API.
This link https://learn.microsoft.com/en-us/azure/ai-services/speech-service/text-to-speech-avatar/batch-synthesis-avatar might be very helpful to debug this issue. Take note on your parameters, large sizes of input or configurations complexity and if you're exceeding API limits, this kind of issue can happen.
I hope this is helpful! Do not hesitate to let me know if you have any other questions.
Please don't forget to close up the thread here by upvoting and accept it as an answer if it is helpful