Smart M-Air unable to register because the maximum number of registered users

Hello,
I am trying to register a Mitsubishi AC on the Smart M-Air app
but the App won’t let complete the process…
When I enter the wifi SSID and Password then press OK, the app displays the following message:
unable to register because the maximum number of registered users

I am using an Iphone13 mobile device.
I tried reinitializing the APP, deleting and re-installing the App without success…
The Smart M-Air app version is latest on teh app store v1.3.005

Any idea how to fix this problem?