Service Portal Opens in New Tab but Page Is Blank

[rakeshnagar]

Hi ServiceNow Community,

I am facing an issue while trying to access the Service Portal in my instance.

When I navigate to:
Service Portal → Service Portal Home

It opens in a new browser tab, but the page remains blank and nothing is displayed.

Instance details:
Instance type: Personal Developer Instance
Browser: Chrome
User role: admin

Kindly suggest what additional configuration or checks are required to resolve this issue.

Thanks in advance.