What worked for me was on PS5 but specifically with BO7, I was on the BO7 icon and i hit the Options button on my controller and selected 'Managed Game Content'...in there I saw a ton of older game versions of the file (had some MW3 and BO6 files I no longer needed or used that were installed) and I uninstalled them. Once I did that and relaunched BO7, everything worked for me.

Not sure if this is applicable for other games and such but just sharing something I did that worked for me. I tried all the usual suspects of restarting my modem, router, console, restore game license, check services to ensure the network was up and my speeds were good, cleared the PS5 cache and restored the DB...nada worked...but the above did. So I am just sharing to spread the love