I have some Omnitron (OST) 70km 7361E-2LR 10G SFP+ modules that don't seem to work in M8024 (original not the -k version) have even tried crossover from M8024 in B1 to B2 and it still doesn't work. I have some 10km OST 7347E-1 that work fine in the M8024 (but not over the 23km fiber run I'm trying to use with CWDM). I have tested with 5.1.4.5 firmware and also 5.1.0.1 without success.
My theory is these 2LR SFP+ may require more power than the M8024-SFP+ can provide per port, have been trying to find any specs from Dell on power with no luck. telnet to the M8024 gives the TX bias current but that with the VDC only accounts for about 0.26 Watt and not the full power consumption of the module. I'm planning to test the modules in some other switches with 10G SFP+ uplink ports would at least like to confirm these will light up, which I haven't seen yet.