I’ve moved your post into the support area, but this is a BeamNG problem not a BeamMP problem.
While our community will still be able to help you with this issue you might get a faster reply on the BeamNG Fourms, their knowledge base is more BeamNG centric.
this is a generic error code and can mean anything. however, in my personal experience, most of the time the “0x00000001 error” has to do with inconsistent / corrupted CACHED vehicle or level files. this happens over long periods of time by simply playing. so if you dont clean your cache regularly - you get the error.
simply go to %USERPROFILE%\AppData\Local\BeamNG.drive\0.xx\temp\ and delete its contents (of the temp folder). this is what “deep clean cache” does. try connecting again! 
likewise, for linux, it’s ~/.local/share/BeamNG.drive/0.34/temp
I tried it on my steam deck in desktop mode and it worked but when I tried going back into gaming mode it stil crashes but doesn’t say anything I think you can’t help but if anyone else knows how to fix this thanks
this is unrelated to the topic of the OP
“gaming mode” aka gamescope will not be able to render native BeamNG.drive.x64 binary because the game was compiled for xorg x11
…please search this up next time…