As the end of year approaches, the Microsoft Dynamics Service Engineering team is reducing available manual-upgrade slots for customer Sandbox and Production environments. This is to help stabilize environments and the overall service during the holiday season.
If upgrading before end of year is an urgent matter for your business, please signup for the Self-service Upgrade Preview Program at the below URL. This program will provide you with a free Sandbox environment with which to perform the upgrade:
At the end of the above survey is a Private Yammer Group link. This Yammer group is managed by the Product team and will be able to assist your upgrade questions throughout December. More details can be found on Process for moving to the latest update of Finance and Operations.