If so, you need SAP Universal ID. In a few months, SAP Universal ID will be the only option to login to SAP Community. Without it, you will lose your content and badges. If you have multiple accounts, use the Consolidation Tool to merge your content.
How MDG supports the functionality "Global Material number". While through searching I could read some content on aspects of MDM supporting this functionality, but could not find the same for MDG. Any inputs on this will be really helpful.