Hello Mihaela.
Welcome to Microsoft’s Community.
We understand that you want information on the Learning Modules for Exam MS-900.
As much as the Microsoft Certification Program would like to assist you with this, inquiries regarding MS Learn are being handled by their support. You can reach out to Microsoft Learn through this troubleshooting guide or provide specific feedback to Microsoft Learn by reporting an issue.
To find a solution regarding your request, we recommend you contact the correct Support team, we can assure you they will provide you with specialized assistance and accurate answers to your inquiry.
In the following link: All Questions - Microsoft Q&A, you can find someone with a request like yours.
Please be advised that Microsoft Certification Program handles inquiry related to Microsoft Certification Profiles, certificates and Exams that are being taken from the Learning Site and is a different platform from MS Learn which help with courses, modules, and labs.
We hope this information is helpful, please let us know if there is anything else we can do for you. If no response is received, we will proceed to close and lock the case after one business day.
Best regards,