Hey @Gabel, Felix, SMD Agent refers to the SAP Solution Manager Diagnostic agent user. Looks like there are some configuration challenges in your individual setup that would require in-depth troubleshooting through support ticket.
Also be aware that the latest collector agent is using Azure KeyVault to store SID config and not the systemconfig file you shared. See step 14 here.
Are you aware of our new agentless offering for SAP systems running on NetWeaver 7.50 and higher? This way you could bypass that problem domain altogether.
KR Martin