What should I do while accessing HENNGE Secure Transfer for the first time?

For Google Workspace.

For Microsoft 365.

Question:

What should I do while accessing HENNGE Secure Transfer for the first time?

Answer:

In the first-time access, there appears such message.
In order to proceed to the next step, click the [Approve] button. 

Once it has been authenticated, this message is skipped from the next time access.