Hello, Martin.
Thank you for contacting Microsoft´s Community.
We understand that you want to know about Microsoft 365 Certified: Modern Desktop Administrator Associate.
Two ways to prepare: Learning paths to gain the skills needed to become certified. You could do your training with the learning paths of learn, in order to obtain your certificate successfully and at no cost.
Modernize your workplace with Microsoft 365 and Surface for Business - Learn | Microsoft Docs
Microsoft 365 - Modernize your enterprise deployment with Windows 10 and Microsoft 365 ProPlus - Learn | Microsoft Docs
Manage your enterprise deployment with Microsoft 365 - Learn | Microsoft Docs
Instructor-led courses
Course MD-100T00-A: Windows 10 - Learn | Microsoft Docs
Course MD-101T00-A: Managing Modern Desktops - Learn | Microsoft Docs
Microsoft 365 Certified: Fundamentals is other Certificate
Only required exams: MS-900
We would also recommend to check our Browse Certifications and Exams page to see all the certifications that we offer. You can filter these certification by technology, roles, and level depending on your desire. Filters are located at the left side of the page.
Additionally, Microsoft has a special free program for all the people and customers with the popular learning paths and modules to improve your abilities: https://docs.microsoft.com/en-us/learn/
We wish we could be of more help, and if any additional assistance is needed, rest assured that we will be happy to jump in and take a look. Let us know if you need assistance with other matters.
If the assistance given solved your request, please indicate “Yes” to the question “Did this solve your issue?” shown below, so other Learners can benefit from this. Remember your feedback is important to improve our service. If no response received we proceed to close and lock the case the next business day.
All the best,
