Teams custom application AppStudio : how displaying a WebSite in personnal TAB

Please let me explain for you my Problems, I'm working in Teams AppStudio, so i want to create a custom app with personnal Tab witch display a WebSite,

1. I have Created my AppManifest correctly,
2. I have inserted my Personnal Tab : in this One I put my Website URL in content URL enter image description here
3. Then I deploy My App in My Teams application,
4. When I go to My App , i have any thing displayed in my personnal TAB, enter image description here

Any Help Please, Thank you