Deploying Project for the web in non-default environment

[mm2221]

I deployed the Project for the web & then Project Accelerator in the non-default environment named "P4WTest" (Type is Sandbox). I am able to see a new app in my list of Office apps as shown below (I have the "System Administrator" and "System Customizer" Roles for this model-driven Power App).

I then shared the "Project" model-driven app with my team members by adding them to security roles (mostly using out of box ones). MS Documentation says "Users with the Project User and Project Common roles will see the Project app tile appears in Office.com – All Apps section"

But they do not see this app in their list of O365 apps. How are they supposed to launch the app? The Unified Interface URL for the model-driven app works when I sent it via email but along with it, how do I make it available in the list of all O365 apps shown in the image below? I also individually added the group members and gave them the same roles "Project User" and "Project Common" but they still do not see it as a tile. The tile shows up for me, not for other members of the environment.

[mm2221]

Once my users that I shared the model-driven app with started to access the app more frequently, the tile started to show up for them in the list of Office apps. The name of the environment is written just underneath the app name to distinguish the default Project app versus the non-default Project app.