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Hi again @nickH I noticed that you are using lower versions of some System apps than what I am testing on. Could you please try to upgrade: - Automation Core to version 1.20.2 - Device Admin to version 1.20.7 - Hardware Support to version 1.20.5 - PLC to version 1.20.6 - Realtime Kernel (see my screenshot above) - Setup to 1.20.1 - snapd to 2.59.2 - Solutions to 1.20.1 You may get the complete archive of all mentioned upgrades from the Collaboration rooms and then search for the System Apps X3 01.20.12 archive. Also just wanted to politely remind you to make a backup of your system configuration before upgrading 😅 I also installed the S2S Authentication sample that you provided and still got the same results. Here are some screenshots. 🟥(S2S Token) Subscription to PLC Datalayer node: plc/app/Application/sym/GVL/SignalleucteGruen1 ✅(S2S Token) Subscription to Datalayer node: framework/metrics/system/cpu-utilisation-percent ✅(Authorization API Token) Subscription to PLC Datalayer node: plc/app/Application/sym/GVL/SignalleucteGruen1   ... View more

I also will leave a screenshot of the system apps versions below . Hope it helps to localize the issue:   ... View more

Hi @nickH Thank you for your reply. I also followed the guides that you specified and I made sure that the node paths was correct in the subscription ( I used tools like online Diff-checker and Notepad++ to see if there were any differences). As I already mentioned the problem only occurs when I use the S2S authentication token itself, and not because of the node path being incorrect. Also, I do not ecounter any errors if I retrieve the token from the Authorization API itself (using username and password). My program logic simply waits for this S2S token file to be generated in the expected directory. Afterwards a SSE subscription request is being made to the exact PLC Datalayer node (see screenshot below) utilizing the S2S token as way of authenticating. However the problem with the DL_INVALID_ADDRESS  for the PLC Datalayer node persists. Best regards, CtrlXplorer ... View more