Legacy Portal Admin Center is no longer available. Manage Power Pages websites from the Power Platform Admin Center.
As part of our commitment to offering enhanced user experiences and streamlined functionalities, the old Portal Admin Center will no longer be available in favor of the much-improved Power Platform Admin Center. Power Platform admin center (microsoft.com)
The new admin center for Power Pages in the Power Platform Admin Center was launched in October 2022. The old Portal Admin Center was deprecated in Dec 2022, with no new features or development and is now being completely removed.
We urge all administrators to transition to the Power Platform Admin Center to continue managing their Power Pages websites seamlessly.