embedded report sign-in not working

I am developing a web application with dotnet with Razor Pages. In one of the pages of the app there is an embed Power BI report. When I cloned the repository with the app, the embed report when I clicked in Sign In is not working. It reloads the report, but the Sign In button appears again. When I open the embed report in other tab (with the other button that appears with the Sign In button) not works too.

Getting the link with HTML element inspect WORKS.

- Tested with Microsoft Edge, Firefox and Google Chrome and none of them works.

- With the same iframe html element, I tested in other dotnet project and WORKED.
- Tried with two Power BI accounts (one of them being the report owner) and didn't worked.

I am certain that is some problem with the dotnet project, but not have any hint.