Viewing organization memberships
In addition to seeing the list of spaces you're a member of, you can also see the organizations you're a part of in the web app.
To see the list of organization memberships:
Log into the web app.
Click on your avatar in the top right corner and select "Account Settings".
Click Organizations in the navigation bar. The Organizations page will open.
From here, you can see the full list of all organizations you belong to.