Hello Steve.
Thank you for all the information you have shared.
We were able to locate your Profile and noticed that both Exams were taken more than two years ago.
Those qualifications are no longer valid to obtain further Certificates. In this case, to work towards an Expert Certificate, we invite you to complete Exam MD-101: Managing Modern Desktops and Exam MD-100: Windows Client to gain the Microsoft 365 Certified: Modern Desktop Administrator Associate, as shown in the image below:

Once you have accomplished this Certificate, you would need to take Exam MS-100: Microsoft 365 Identity and Services and Exam MS-101: Microsoft 365 Mobility and Security to obtain the Microsoft 365 Certified: Enterprise Administrator Expert.
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Kind regards,