Were you trying to spend on the Bitcoin or Bcash networks?
Yes on the Bitcoin network
When did you receive the UTXOs that were used to fund the transaction? (Bcash split off in Aug. 2017, so if the UTXOs are post-Bcash, you never had that Bcash in the first place.)
In July.
Is Armory properly synced with Core? Which versions of Armory and Core were you using at the time?
Everything was synced with core properly, it was with the current version at that time (July)
Many thanks.