@Preston K. Parsard Welcome to Microsoft Q&A, Thank you for posting your here!
Managed disk are supported for all VM sizes in Azure.
Additional Information: While deploying a new Virtual Machine with any Size (Configuration) by default the managed disk option is selected in the disks blade. For more managed disk related queries please refer this document
Hope this helps!
Kindly let us know if the above helps or you need further assistance on this issue.
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