Hello @Shubam Agarwal (Cognizant Worldwide Limited),
Welcome to the MS Q&A platform.
By looking at your error message: VS403654: The push was rejected because it might contain one or more secrets.
It looks like there are credentials or secrets on your repo files.
Please try to delete this sensitive data and see if it resolves the issue.
In addition, please also check if this issue exists on all repo or the specified repo.
To help narrow this issue, can you create a new project with a simple repo and check?
A similar thread has been discussed here.
I hope this helps. Please let me know if you have any further questions.