after cross progression game is saying party not ready even when i am solo

Same problem here.

I tried this and it was fixed for a game only and then back to the same.

• 1. Press the Windows key and type in “services.msc” and press enter.
• 2. In the list of services, scroll down to “UPnP Device Host”, click it and press the stop button located in the top taskbar (black square).
• 3. Now do the same thing with the service “SSDP Discovery”.
• 4. Exit the window and navigate to the Control panel-> Network and Internet-> Network and Sharing Centre-> Change advanced sharing settings (to the left)-> Under “network discovery” and select to turn off network discovery.
• 5. Save your changes.

LINK