Interestingly... I have Armory and Bitcoin Core v0.25.1 working ok, but the Testnet version of Armory is exhibiting a similar behaviour to what the OP has. Armory Testnet is getting stuck at "Scanning Transaction History".
It is always at 88% (tried it 3 times now)... very strange. I can't find any obvious errors anywhere that are causing this issue. :-/
There's a weird tx in testnet that breaks the DB scanner. I have fixed this in the dev branch, but that code is for along compared to 0.96.5 that I can't just ship the fix back into it.