Most likely, it's not online.
Armory requires a full node like Bitcoin Core or similar to operate, use Bitcoin Core for max compatibility.
Do you have Bitcoin Core installed and fully synced without "
prune blockchain" settings?
If not: install it, disable "
prune block storage to" setting and sync the blockchain (
requires 400GB+ disk space).
After that, setup armory's pathing correctly:
https://btcarmory.com/docs/pathing