After clicking the activation link, device opens the same app twice

Hi, after clicking the activation link in my email inside gmail , a dialog box is shown to ask if I want to open this link using a browser or my own app. I click on the icon of my own app, and instead of being direct to my already opened app ( the 1st one ), the device switch on the same app ( the 2nd one ) and lead me to the homepage where it shows all the button for the various login method.

I am having two my app of the same thing being turn on in my device and running concurrently. What is the problem here?

I am using Android in this test.

The issue names no source files, tests, or entry points. Reproduce the activation-link flow on Android from Gmail, then inspect how the app handles the link and launches when an instance is already open. Done means the existing app is reused instead of opening a second instance and the activation flow reaches the intended screen.

Written by the indexing model from the issue text.