Login Server Error: Value cannot be null. Parameter: Stream or Failed to read authentication response [err: unexpected end of file][line: 1][col: 1]
The message "Value Cannot Be Null" or "Failed to read authentication response" on the launcher indicates that the servers may be down for maintenance or down due to outages. Please check the appropriate forums link to make sure there is not currently any scheduled downtime or if there are any reported outages:
If the servers are not down for maintenance or reported outages, we recommend reviewing and performing the steps in the article here.