Vodafone here as well, but again I can’t exactly say anything since I picked batches C and D and they haven’t exactly shipped yet.
I don’t see how any network could disallow the L5, unless somehow your specific IMEI got put on to the shared blacklist. I don’t mean it from a technical perspective, it’s more that I don’t believe that they’re actually allowed to lock out users with compatible equipment (which is the same case as for the rest of the EU).