CIG have addressed these issues on the status page for their web services:
source:
status.robertsspaceindustries.com
“Since the launch of Star Citizen Alpha 3.18.0 our teams have been monitoring a number of issues players have been encountering while attempting to log into the game. These have primarily manifested in the form of 19003 and 19004 with a mix of other similar codes.
While monitoring those issues, the team has been able to tune and make adjustments to the entitlement processing flow to ensure that a large portion of player attempts were still successful and able to make it into the PU.
However, at a point in the early morning UTC, the environment entered into a state which would require a more disruptive recovery process.
As of 1300 UTC on 2023-03-12 the environment has been in the process of recovering from the slow / non-responsive state it was in but we wanted to advise that, while this recovery effort is in-progress, players will experience periods of extreme difficulty getting into the PU. We expect players to see a mix of errors from the 19k, 30k, and 60k ranges.”
during these times it’s advised to play on the PTU until these issues are fixed
stay safe friends :)
source:

Current Status | Roberts Space Industries
Keep up to date with real-time and historical interruptions to our service which may be affecting you.

“Since the launch of Star Citizen Alpha 3.18.0 our teams have been monitoring a number of issues players have been encountering while attempting to log into the game. These have primarily manifested in the form of 19003 and 19004 with a mix of other similar codes.
While monitoring those issues, the team has been able to tune and make adjustments to the entitlement processing flow to ensure that a large portion of player attempts were still successful and able to make it into the PU.
However, at a point in the early morning UTC, the environment entered into a state which would require a more disruptive recovery process.
As of 1300 UTC on 2023-03-12 the environment has been in the process of recovering from the slow / non-responsive state it was in but we wanted to advise that, while this recovery effort is in-progress, players will experience periods of extreme difficulty getting into the PU. We expect players to see a mix of errors from the 19k, 30k, and 60k ranges.”
during these times it’s advised to play on the PTU until these issues are fixed
stay safe friends :)