Many common hard drive or OS problems on a Mac can be resolved by running Repair Disk.
Troubleshooting steps for resolving error message.
Can't Upgrade Call of Duty: Black Ops 4 Standard to Digital Deluxe
More information about authenticator security codes
Troubleshooting for Authenticator Error - Please Connect to a Network: Your device is currently not connected to a network. Please try again later.
Troubleshooting for Partially Installed Errors when trying to access certain game modes.
A guide for diagnosing and repairing problems with physical hard drives.