To be able to test IMW in a Sandbox environment, firstly, the IMW application has to be downloaded from the Marketplace in Business Central, and then you must download the IMW application for Android from Google Play
Then to configure the app and be able to use it, you must follow the following steps:
Firstly inform the email and description of the person requesting the license.

Then, click on the “License Request” option.
Once the application has been restarted and the license validated by IM PROJECTS, then the following screen will appear. And Then, click on the “Login on Business Central” option:

On this screen, do Control+V directly to copy the verification code from the clipboard. By default, it should already come without doing anything, and clicking on the Next button.

Then, inform your user and password from Business Central access:

If all the information is correct, The following confirmation screen will appear:

Return to the IMW access, and click on the “View available environments” button:

To finish the process, just select your environment to continue:
