Working Mechanism of OAuth 2.0 in EPM Automate - Device Code vs JWT

Summary:

When a refresh token is fetched using Device Code Grant type and used in EPM Automate, it recognizes and executes jobs such as ListFiles etc as an example BUT when a refresh token is fetched using JWT and used in EPM Automate, it fails with 401 Auth error "failed to fetch access token". Former is Mobile App and latter is confidential app. Does EPM Automate do not support JWT Refresh token?