Some months ago, Microsoft Connect was retired in favor of new tools and services to engage with Microsoft. The only feature we were still missing is creating Extensibility support request to enable extension scenarios and this feature is now enabled in Lifecycle Services.
Use the Support tile in your Dynamics 365 for Finance and Operations (#MSDYN365FO) project and go to Support > Work items > Extensibility support request > Create extensibility support request:
The template for this form is different and, depending on the selected Request type, different fields needs to be provided. After the work item is created, this list can be used to track when the request is processed by Microsoft.
More information in the docs Extensibility requests.