Update with a possible solution. Please try the following.
Locate DefaultEngine.ini in C:\Program Files\Unreal Engine\Launcher\Engine\Programs\NoRedist\UnrealEngineLauncher\Config
Add the following lines to this ini (without the bullet points):
- [Portal.OSS]
- EntitlementUpdateCheckTime=600
Save the ini and relaunch the Portal. Please let us know if this helps. If not, please provide new “veryverbose” logs for us again.
Thanks!