Hi everyone, sorry for the late reply.
Thank you for helping us report this information, I can see there has been three weeks worth of posts from players about this on different platforms, so I have now added them to our report for the QA team. I hope we can update you on this soon, thank you for your patience while this is still being investigated, we will try to let you know when the QA team get back to us. Hopefully these new reports will further help the team to replicate this now.
As always if you haven't already tried, please make sure to try all the steps in our connectivity guides for Siege here -
PC -
https://ubi.li/YPwnl
XB1 -
https://ubi.li/dy5LX
PS4 -
https://ubi.li/12soI
Please let us know if any of these guides help you with these error codes in the time being.