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iWAN over 4G - Not Working

We are trying to replace a T1/MPLS transport with a 4G-LTE transport.  The routing comes up, but the connection to the Master-Controller never comes up. 'show domain IWAN2 master status' - reveals a few things that are really different:

 

Minimum Bytes Loss Calculation Threshold: 10240 bytes
Minimum Requirement: Not Met

 

In the logs I see:

Jul 31 11:26:57.235 EST: %DOMAIN-4-BR_SHUTDOWN: Reason=Minimum Requirement Not Met. Details:Instance=0: VRF=default: Min Requirement Mask=9
Jul 31 11:26:58.285 EST: %DOMAIN-4-MC_SHUTDOWN: Reason=Minimum Requirement Not Met. Details:Instance=0: VRF=default: Min Requirement Mask=1
Jul 31 11:26:58.291 EST: %DUAL-5-NBRCHANGE: EIGRP-SFv4 59501: Neighbor 10.42.0.250 (Loopback0) is down: static neighbor unconfigured

 

is there some obvious answer for this?  I keep thinking it's MTU related, buy maybe it's multicast related.  I'm not sure

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