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?

thanks

James

{
“connectivity”: {“status”:“NetworkError”,“status_code”:504,“error”:“error: Error: ETIMEDOUT, response code: undefined, body: undefined connected? undefined”},
“external_ip”: {“actual_external_ip”:“82.132.218.73”,“router_external_ip”:“10.65.82.242”},
“status”: “status”: MultipleNatFound
,
“natpmp_autoconfig”: {“status”:“NotFound”},
“upnp_autoconfig”: {“server_ip”:“192.168.1.1”,“found_upnp”:true}
}