Thank you Stephan for the answer.
I guess I am doing something fundamentally wrong, here is what I do:
Reports -> Add Report -> Add Name -> Template: "Data Table (24h interval)" -> Not adding Sensors / Filters by Tag -> No Schedule -> Reported Period: Current -> Report Period Type: Day (same results with Week) -> No Percentiles -> No Data Files -> give needed Access Rights -> Continue -> Select Sensors Manually -> Add a sensor SSL (where i can see the historic Data if i browse to it) -> leave all the ticks on ->
I only get values if I chose "Last Month" as Quick Range, anything less gives no Data.
Obviously the numbers I get for "Average (Days to Expiration)" are not what the report is needed for.
Is it just not possible to get only the last value in a report or am I screwing up here?
Thanks in advance for your time!