When you believe you have discovered a product-defect and you would like to report it to Microsoft support, our frontline engineers will investigate the issue and if it’s decided to submit a hotfix request to the Product Group they need to collect all required information in a special format.
I believe if we get the required information from the start we can verify the issue on our side and pass it to the development team quicker. Please review the 
Issue Description Example to understand what we expect to receive and here is a Bug Template that you can use when submitting a new support request. You can now use Microsoft Dynamics Lifecycle Services Cloud powered support to upload your repro and open a support request.
I hope it can help Microsoft Dynamics AX Partners reducing the time to receive a solution.