ARC Double Nat on 4G Router

Hi i’m using a 4G router as we live in the countryside and its the best way to get internet. I use a TP link Archer MR600 with 3 deco mesh nodes set up in access point mode - which should avoid double nat. However, i’m still getting this error message? Any advice?



“connectivity”: {“status”:“NetworkError”,“status_code”:504,“error”:“error: Error: ETIMEDOUT, response code: undefined, body: undefined connected? undefined”},
“external_ip”: {“actual_external_ip”:“”,“router_external_ip”:“”},
“status”: “status”: MultipleNatFound
“natpmp_autoconfig”: {“status”:“NotFound”},
“upnp_autoconfig”: {“server_ip”:“”,“found_upnp”:true}