Assuming that LEVC's taxi time is 10 minutes, I think I might have a good idea of what happened
It boils down to this:
1. Your flight didn't receive a slot because according to your EOBT, routing, altitude and speed, it was not necessary to issue one.
2. When you don't have a slot (or CTOT) you have a ETOT (estimated take off time) to comply with: ETOT = EOBT + 15 minutes tolerance + airport Taxi Time.
3. So, in your case ETOT = 1400 + 15min + 10 min Taxi time = 1425.
You can have a look at Eurocontrol's ATCFM manual on this link, it actually has a lot of useful information:
http://www.cfmu.eurocontrol.int/cfmu...ual_latest.pdf
Of course, if LEVC's taxi time is something other than 10 minutes... then I have no idea of what went down
By the way, your FPL is suspended only after 30 minutes after EOBT + TAXI TIME! And it will be suspended while you taxi, while you line up and even on the departure roll!