The MME/SGSN refused this request due to Visited-PLMN policy (MME/SGSN refuses due to VPLMN Policy) -- the visited network's own local policy blocked it, independent of the subscriber's home-network provisioning.
In the Cause IE of a GTPv2-C response (Create Session, Modify Bearer, Delete Session…) on S11, S5 or S8.
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