PME Web Applications Error when adding subscriptions "An unexpected error has occurred. Your request cannot be processed at this time. If the problem persists, contact the Webpage administrator".

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Issue
The following error occurs when clicking on Add Subscription in PME Web Application → Reports → Manage subscriptions

"An unexpected error has occurred. Your request cannot be processed at this time. If the problem persists, contact the web page administrator".
An error will appear in the System Event log in the Management Console: Could Not Authenticate

Product Line
Power Monitoring Expert 8.x
Power Monitoring Expert 9.x

Environment
Web Applications Reports

Cause
When clicking on Add subscriptions, Web Applications needs to identify and authenticate IONUser (the windows user that is created at the time of installation). If the IONUser has not been granted the Local logon type, the logon fails. The following error appears in Event Viewer Security.

Account for Which Logon Failed:
Security ID: NULL SID
Account Name: IONUser
Account domain: "DomainName"

Failure Information:
Failure Reason: The user Has not been Granted The requested Logon type at this machine.
Status: 0xC000015B
Sub Status: 0x0

Note: if "Unknown user name or bad password (Status: 0xC000006D, Sub Status: 0x000006A) is observed instead, refer to FA384405.

Resolution

Assign IONUser as a member of a group that can log on locally or grant IONUser permissions to log on locally.
Local security

Method 1: Give IONUser permission to log on locally

1. Navigate to Control Panel → Administrative Tools → Local Security Policy.
2. Inside of Local Security Policy navigate to Local Policies → User Rights and Assignment.
3. Select Allow log on locally. Here you will see the groups that are allowed to log on locally.
4. Select Add User or Group.
5. Enter IONUser and select Check Names. It will automatically enter the name of your PC in front of IONUser.
6. Select OK to exit the Allow log-on locally Properties window.
7. For additional information check: Logon failure: The user has not been granted the requested logon type at this computer (Win Server 2008 R2) | Microsoft Learn

Method 2: Add IONUser to a group that can log on locally

1. Navigate to Control Panel → Administrative Tools → Computer Management.
2. In computer management navigate to Local Users and Groups → Users and select the IONUser.
3. In the IONUser Properties navigate to Member Of and select Add.
4. Enter a group from the list that was shown in step three of the previous instructions and select Check Names. It will automatically enter the name of your PC in front of the selected group. Make sure the PC name is there then select OK.
5. Select OK to exit the IONUser Properties window.
Note: If due to IT policies, local users are not allowed to log on nor created, a domain account can be created for IONUser using FA400776.