If your credentials didn't worked, click on your profile picture (this scream, top-right corner) go to: user settings > Developer Settings > Personal Access Tokens > New token
use the token as your password and the email you use on the mendix portal as your username.
Hi Tharun,
This should be the same as your Mendix Credentials
Hi THARUN BALAJI J S,
Try this
Close that popup message and again open the app.