Hello Saif,

For the testing Environment of your application, have you created a user for the application, In case you are trying to login to your application with your dev environment credentials you will not able to do that,

For testing Environment you have to add the user and provide roles to access to your application.

you can create by going to https://{your test evvironment addresss}/Users/, 
And give roles to the user you will create.

hope this helps

Thanks

Hi Saif,

Elborating on the answer of Tousif, although the IT users (your Service Studio and Service Center login) are managed centrally in LifeTime, so you need only a single login for all environments, normal application users have to be created and maintained per environment. Each environment has its own copy of the User entity, so users of the development environment are not available in the test environment¹. This is actually a good thing, as you probably wouldn't want production users to be able to login on the test and dev environments.

¹LifeTime sunchronizes IT users to all environments, by making a copy of each IT user in the User entity of each environment.