I think that MB-900 was updated by MB-901. They have the same content.
MB-901 is available to schedule exams.
MB-900 MS D365 Fundamentals Exam Retired
Emily Moodley
1
Reputation point
When will MB-900 be republished?
3 answers
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Bruno Ribeiro 1 Reputation point
2020-04-16T16:46:49.497+00:00 -
Timileyin Abioye 1 Reputation point
2020-02-12T20:45:06.31+00:00 MS-900 Microsoft Dynamics 365 Fundamentals has not been retired yet. Check out all exms/certifications on Microsoft Learn, you will find it as one of the valid exams
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Dave Patrick 426.1K Reputation points MVP
2020-01-24T15:03:35.777+00:00 QnA currently only supports the products listed in right-hand pane (more to be added). Better to reach out to subject matter experts in dedicated forums over here.
https://trainingsupport.microsoft.com/en-us?auth=1
(also search them out here)
https://learn.microsoft.com/en-us/learn/certifications/browse/?term=dynamics%20365