Threat intelligence data, which feeds do you use generically and with Cisco firepower/FMC?

Hello, which feeds are you using to get threat data using common protocols like TAXII? I'm trying to register Alienvault OTX feed inside FMC firepower but it is stuck in "parsing status" since days... does anyone was able to use Alienvault with Firepower stuff? (p.s. there is a bug I spotted on Cisco site related apparently to this... but I want to share before doing some of the "suggested workaround".... (like killing mongo databases, resetting redis stacks... etc... wow how many things are inside this thing??? :) )