I connected the item to ALEXA and it seems properly configured.
Unfortunately, it doesn’t work: when the command is sent via ALEXA, OH elaborates it but then nothing happens. According to the logs, everyhting is smooth an no issues:
Have you validated by e.g. manually via script / rule / rest API if the uppercase command is causing that the command will not be executed?
If that’s really a case (as it was just a guess from my side) you could build a workaround via rule to resend an uppercase as a lowercase command (but first I would test if that’s really the issue with the irobot)