The adapter rejected the commit because it was invalid - Error

I just setup a new Monitor One Development device. When marking as development device and want to save new gateway settings I get the error: "The adapter rejected the commit because it was invalid".

I did a factory reset and schema configration update which did not resolve this issue.

Just to be sure: Is the console showing the Monitor One Settings in your fleet settings? It should include "IO" and "IO Calibration" as tabs.

Yes, the tabs IO and IO Calibration are present.

Still an issue, anybody has a solution?