Unable to create APNs key

I am unable to create a private key to access APNs services from the Developer Portal (developer.apple.com).

I take the following steps:

• Sign in to developer.apple.com
• Go to Keys (https://developer.apple.com/account/resources/authkeys/list)
• Click "Create a key"
• Check the enable box in front of "Apple Push Notifications service (APNs)"
• A message in red shows up in the same table row: "This service must have one identifier configured.". A "Configure" button appears.
• Click on the configure button
• A new page loads at the following URL (https://developer.apple.com/account/resources/authkeys/add) displaying an error dialog with the text:

"Unexpected error occurred An unexpected error occurred. Please try again. If the problem persists, please contact Apple Developer Program Support. https://developer.apple.com/support"

I contacted support but that might take ages.

Error in browser console is as below for this URL: https://developer.apple.com/services-account/QH65B2/account/auth/key/realms/list

{
    "responseId": "a204b125-f8c2-44f2-82f3-269a2e35265c",
    "resultCode": -1,
    "resultString": "Unexpected error occurred",
    "userString": "An unexpected error occurred. Please try again.  If the problem persists, please contact Apple Developer Program Support. https://developer.apple.com/support",
    "creationTimestamp": "2024-10-16T11:51:41Z",
    "protocolVersion": "QH65B2",
    "userLocale": "en_US",
    "requestUrl": "https://developer.apple.com/services-account/QH65B2/account/auth/key/realms/list",
    "httpCode": 200
}