Cannot enable PowerTools for RHEL 8

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Hi community, I'm trying to enable PowerTools on my RHEL 8 workstation. So I typed dnf config-manager --set-enabled PowerTools, but got this error message:

[root@rhel ~]# dnf config-manager --set-enabled PowerTools
Updating Subscription Management repositories.
Error: No matching repo to modify: PowerTools.

I've searched on Google about RHEL 8/CentOS 8, all posts I found are mentioning this method. But unfortunately this did not work in my case. Can I have your help please?

Here are all available groups:

[root@rhel ~]# dnf grouplist
Updating Subscription Management repositories.
Red Hat Enterprise Linux 8 for x86_64 - BaseOS (RPMs)                                                                                                                                                                         255  B/s | 4.1 kB     00:16    
Red Hat CodeReady Linux Builder for RHEL 8 x86_64 (RPMs)                                                                                                                                                                       31 kB/s | 3.7 MB     02:00    
Red Hat Enterprise Linux 8 for x86_64 - AppStream (RPMs)                                                                                                                                                                      276  B/s | 4.5 kB     00:16    
Available Environment Groups:
   Server with GUI
   Server
   Minimal Install
   KDE Plasma Workspaces
   Custom Operating System
   Virtualization Host
Installed Environment Groups:
   Workstation
Installed Groups:
   Development Tools
   GNOME Desktop Environment
   Hardware Support
Available Groups:
   Legacy UNIX Compatibility
   Smart Card Support
   RPM Development Tools
   Headless Management
   Container Management
   .NET Core Development
   System Tools
   Scientific Support
   Security Tools
   Graphical Administration Tools
   Network Servers
   Fedora Packager
   Xfce
   Games and Entertainment
   Graphical Internet
   KDE (K Desktop Environment)
   Sound and Video

And what I've enabled:

[root@rhel ~]# dnf repolist
Updating Subscription Management repositories.
repo id                                                                             repo name
code                                                                                 Visual Studio Code
codeready-builder-for-rhel-8-x86_64-rpms      Red Hat CodeReady Linux Builder for RHEL 8 x86_64 (RPMs)
epel                                                                                  Extra Packages for Enterprise Linux 8 - x86_64
epel-modular                                                                 Extra Packages for Enterprise Linux Modular 8 - x86_64
google-chrome                                                             google-chrome
raven                                                                                Raven's RPM repo for el8-x86_64 - base
rhel-8-for-x86_64-appstream-rpms                      Red Hat Enterprise Linux 8 for x86_64 - AppStream (RPMs)
rhel-8-for-x86_64-baseos-rpms                             Red Hat Enterprise Linux 8 for x86_64 - BaseOS (RPMs)
rpmfusion-free-updates                                             RPM Fusion for EL 8 - Free - Updates
ZY

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