session manager error exit status 1

I would look to leverage this guidance within re:post to fully troubleshoot run command failures.

https://repost.aws/knowledge-center/ssm-run-command-failures

It looks as though your session hasn't been completely established or there could be a problem with timeout settings depending on the command you are sending.

Let me know if you have any issues with this, or if it helps you then please accept my answer after you've tried it out - it would be much appreciated! Good luck :)