That's weird, I can't get it to match the UID. I'll keep trying.
This means that you are entering a wrong root key.
How do you enter the root key? Do you type it? Just copy it from your backup and paste it in brainwalletx. It should be entered with the correct format.
If I import it into armory, is there anyway to check in armory if the wallet ID is matching?
You can try it. But it should generate the same addresses and the same ID as that tool.
Again, brainwalletx doesn't generate segwit addresses.
A question:
Have you backed up the wallet yourself or you have gotten the backup from someone?
I hope someone isn't trying to scam you.