The MD-100 exam is no longer beta. It is one of the required exams to earn the Microsoft 365 Certified: Modern Desktop Administrator Associate (MD-101 is the other).
The MD-100 is still in production, so there are exam objectives that we have not covered yet (should be finished soon).
You will need to take the MD-101 exam before you receive a certification. (Microsoft 365 Certified: Modern Desktop Administrator Associate)
The Microsoft Certified Professional certification is no longer available. When you pass an MCP exam, it will be added to your transcript but you may not be able to take advantage of all program benefits until you successfully earn your first certification. You can review all certifications associated with the Microsoft Certification Program on the Microsoft Technical Certifications page.