Dear Deriv Community members,
Authorization failed or Invalid account error message is commonly seen when you have entered incorrect login information. This includes either an incorrect Deriv MT5 login ID, server, or password.
The error message of your MT5 will be shown in the journal section:
You may easily find your DMT5 account login information in the CFDs section of the Trader’s Hub here.
Click on the Open button to see your login information for the Deriv MT5 account
Use the right server
If you are trying to log into your MT5 platform and receiving an error of “Authentication Failed” despite using the correct account number & password, it could be due to the server you are using to access the account.
Please refer to the Trader’s Hub to see the correct servers to use.
Select the server corresponding to your chosen company. For example, if you choose BVI, options include DerivBVI-Server, DerivBVI-Server-02, and DerivBVI-Server-03 for real accounts, and Deriv-Demo for demo accounts.
If you don’t remember your Deriv MT5 password, don’t be alarmed, you can change it here and follow the guide to reset your password.
If you would like to know how to reset/change your Deriv MT5 password, you may go ahead are refer to this post:
We hope this information serves as your guide when logging in to your Deriv MT5 account. 
If you have any questions, please visit our Help Centre or contact us via Live Chat and WhatsApp.