I have an environmental problem somewhere in OWIN and I want to get some information about what is happening. I have read that I can enable tracing but can\'t find much info
Not 100% sure that this will solve your issue, but we got it working with following config. Slight difference in the following line:
Notice that the tag includes a switchName (and switchType) attribute which is missing from your example. I think that this instruction links the TraceSource with the Switch and makes the entire work.
In our case, we use trace listeners for Azure Web sites (and web jobs).