Group Policies in Meraki can include firewall rules, traffic shaping, content filtering, VLAN tagging, etc. When you see "srcCidr": "OBJ(...)" or "destCidr": "GRP(...)", these are references to policy objects or groups, not raw IPs or CIDRs. The Meraki API currently does not support using object/group references like OBJ(...) or GRP(...) directly in firewall rules via the API. It expects valid CIDR notation or VLAN IDs.
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