Bad Request open two tabs with the same web

[Yagamisama99]

We have a problem (Bad Request) using Azure AD B2C, when open two tabs with the same web app, the steps to reproduce the behaviour is:

1. Open the portal URL
2. Click on Register as New User
3. Copy URL to another tab on the same browser
4. Click on Register as New User (on the second tab opened)
5. Once the registration screen opens, click on “Login”
6. Return to the first tab and click on “Login”
7. Then first tab shows error Bad Request (400)

Can help us with this problem? I look for the solution but in any post is resolved.

[Yagamisama99]

Can anyone helpus with this issue?