Double-check your Bitcoin core Armory won't work if you running Bitcoin core at pruned mode you can find it under settings and uncheck the prune or you can edit bitcoin.conf and add prune=0 if you don't have bitcoin.conf you can create and add that line.
The blockchain hasn't been downloaded in prune mode and the problem should be something else.
If prune mode was enabled in bitcoin core, Armory wouldn't scan any block. According to the log posted in the OP, Armory has scanned 673990 blocks successfully.