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Odd Tunnel Interface behavior - one end requires "no keepalive"

Where's the quick version.  Tunnel between sites A & B.  This is GRE o IPSEC, but I don't think that's the issue.  Tunnel comes up and works great when:  site A has no keepalives and site B has no keepalives,  and it works when Site A has keepalives turned on and Site B does not.  The moment I turn on keepalives on site B, the tunnel goes down.

This isn't a simple config.  Site A is an MPLS PE, meaning the Tunnel interface is configured with an fVRF and iVRF.  Site B has no VRF's - it is the CE.

Any ideas on how to fix?  I need Site B's Tunnel interface to go down when connectivity fails.  My current workaround is to use EIGRP to update the routing tables.  I need to be able to support redundant paths with static and floating routes.

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