FiiO M21 - is Roon Ready?

The relevant source is the Roon partners page and it says no:

It’s possible that they applied and are in the certification process, but as is often the case someone might have jumped the gun. (If there is a printed manual, they may have a deadline for printing so might be inclined to add it already)

On the other hand…

… but as long as Roon Labs does not make it official, there may not be a guarantee. We have seen cases before where a device at first appeared as RR only to disappear again.

Probably a question best asked to Support.