When receiving error messages invalid account/ authorization failed / unauthorized this relates to you either entering your password incorrectly or choosing the wrong server.
Please be sure to select the correct server details:
METATRADER 4
For Windows/ MAC
NashMarkets-Live: mt4.nashmarkets.com:443
NashMarkets-Demo: mt4demo.nashmarkets.com:443
For Android/iPhone
Live: Nashmarkets-Live
Demo: NashMarkets-Demo
METATRADER 5
For Windows/ MAC
NashMarkets-Live: mt5.nashmarkets.com:433
NashMarkets-Demo: mt5demo.nashmarkets.com:433
For Android/iPhone
Live: Nashmarkets-Live
Demo: NashMarkets-Demo
If the server selection is not the issue, please try resetting your MetaTrader password.
This can be done from the My Accounts section by following the below steps:
Click on My Accounts.
Click on View on the account in question.
Click on three dots.
Select Change Password.
Click the Change Password button to confirm.