As feared by @rahveein 2019 rclone appears to lock its config file while running.
Not a problem with static configs but syncing two OneDrive targets in parallel brings AUTH errors for the later started sync job*.
My workaround is using separated configs but I'm not sure this is intended behavior so I just tell you my sighting.
HTH!
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* each job runs flawlessly when it's the only rclone instance
Run the command 'rclone version' and share the full output of the command.
rclone v1.62.0
os/version: Microsoft Windows 10 Pro 21H1 (64 bit)
If there is an issue with the rclone.conf saving, we'd want to see it via a debug log so recreating it would be helpful as we've had numerous discussions on the rclone.conf / how it works and not saying you haven't found a bug, but if so, we'd need to fix it.
This should work. Rclone goes to some effort not to overwrite writes by other rclones in the config file. Its not foolproof but it does usually work.
Rclone will debug things about loading the and saving the config file so we we could see those debugs from the two processes, maybe we can work out what is going on.