I don’t know if this is the wrong category but today at around 20:00zulu I was flying circuits around EDDW. There was a Tower online which I wanted to ask for feedback. But now I don not remember his name anymore. I was flying under the callsign D-EHEM. His name was Olaf or similar. Does somebody know how I can find his CID?
You could register at the forum of VATSIM Germany and then look for him there. There’s also a dedicated feedback-thread for the EDWW FIR.
Or, as a more general option, go to https://stats.vatsim.net/stats and on the search, search by callsign
You do have to know the full callsign though