Hi Michael,
You would update to the Microsoft 365 Apps version. It the moment, the new Outlook exam (and by extension the certification) shows as coming soon:
https://learn.microsoft.com/en-us/certifications/microsoft-office-specialist-associate-m365-apps/
Below video (first part of it) has information about the Microsoft 365 Apps exams:
https://www.youtube.com/watch?v=h0i-m4Xxpb8
If you have more questions about the above please post in Certification forum:
https://trainingsupport.microsoft.com/en-us/newthread?threadtype=Questions&forum=mcp
Please click Accept Answer if the above was useful.
Thanks.
-TP