It will be great to know what your computer setup is like GPU, CPU, Motherboard, Windows version, etc.
Here is AMD latest MAYA Plug-in : https://www.amd.com/en/technologies/radeon-prorender-autodeskmaya
Have you downloaded AMD MAYA Plug-in GUIDE to see if it mentions how to use Animation in Rendering? You can download it from the above link.
Under RENDERING it does mention this:
This Youtube video shows how to render Animation in Maya: Rendering a Video Animation in Maya 2019 - Tutorial - YouTube
From Maya Authors showing all the Plug-ins that you can use to Render Animation in Maya: Animation, Rendering | Plugin, Add-on, Extension for Maya | Autodesk App Store
For better Radeon ProRender support experience
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