The Red Hat Enterprise Linux Server Channel is missing to show from the list of the Software channels for import in the Import Patch Data for Red Hat.
Patch Management Solution for Linux 8.x.
'Incremental Import' option is checked.
When running the Red Hat channel import for the first time, ensure the 'Incremental Import' option is unchecked in the 'Import Patch Data for Red Hat' task to import all the Red Hat subscribed channels properly.