I'm pretty sure Auto-VPN (and SD-WAN) will work fine on an MPLS link. I think Alex's reference to "labelled traffic" means the MX won't run MPLS tagging - but from a typical customer perspective, any Ethernet-delivered IP circuit should be fine. The MX can now run BGP, but in a "pure" Auto-VPN / SD-WAN environment there's no need as all the routing is done via the tunnels - the MX just uses the WAN IP address for connectivity, so only needs a static route to the PE.
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