@girish Yes, this was it. I did not manage to see the actual json. But seems like n8n always adds quotes using the name / value combination. I changed it to this:
{ "nodes": [ { "parameters": { "requestMethod": "POST", "url": "=https://my.xxx.de/api/v1/notifications/{{$node[\"Item Lists\"].json[\"id\"]}}", "jsonParameters": true, "options": {}, "bodyParametersJson": "={\n\"acknowledged\": true\n}", "headerParametersJson": "={\"authorization\": \"Bearer xxx\"}" }, "name": "HTTP Request1", "type": "n8n-nodes-base.httpRequest", "typeVersion": 2, "position": [ 1100, 300 ] } ], "connections": {} }Now it's working. I used this:
Bildschirmfoto 2022-06-14 um 18.16.17.png
instead of this:Bildschirmfoto 2022-06-14 um 18.16.42.png