My game won't download no matter what.

I did like everything I could. I restarted my console router. Did a factory reset. Shut down my console and power cycle it. Went to Microsoft support and they couldn’t get it fixed. I just get the error code 0x87e00064. I am downloading my game digital. I have plenty of space to download my game. I bought Forza Horizon 4 from the Forza Horizon 3 and 4 bundle. I am wondering if there is a possible way to get this downloaded. I also updated my Xbox to the latest version and everything. And then my other games can download but not Forza Horizon. So I paid 60$ for nothing. Can anyone help?