Ugrade Power BI Server to version May 2023 - Dialog Box Promting for Credentials

Dear all,

after upgrading Power BI Server to version May 2023, A dialog box prompting for credentials appears as exemplified in the image below.

Power BI Server Prompt

The autentication setup on the ReportServer.config file is the same as before and as follows:

<Authentication>

<AuthenticationTypes>
<RSWindowsKerberos/>
<RSWindowsNegotiate/>
<RSWindowsNTLM/>
</AuthenticationTypes>
<RSWindowsExtendedProtectionLevel>Off</RSWindowsExtendedProtectionLevel>
<RSWindowsExtendedProtectionScenario>Proxy</RSWindowsExtendedProtectionScenario>
<EnableAuthPersistence>true</EnableAuthPersistence>
</Authentication>

In our production environment where we havent yet upgrated there is no issue. 

Any Ideias?

Many Thanks for your support.