Stoops execution with Argument is NULL exception

> Please provide us with the following information:
> ---------------------------------------------------------------

### This issue is for a: (mark with an `x`)
```
- [x] bug report -> please search issues before submitting
- [ ] feature request
- [ ] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)
```

### Minimal steps to reproduce
> run the script on a Win11 PC jopined to Azure AD

### Any log messages given by the failure
> =====================================================
> Test Device Registration Connectivity
> =====================================================
>
>Test-DeviceRegConnectivity log file has been created.
>
>Testing Internet Connectivity...
>Checking winHTTP proxy settings...
> Access Type : PROXY
>Proxy Server List : DirectAccess (kein Proxyserver).
>Proxy Bypass List :
>
>Checking winInet proxy settings...
> Proxy Enabled : No
>Proxy Server List :
>Proxy Bypass List :
> AutoConfigURL :
>
>Testing Device Registration Endpoints...
>Testing connection via winHTTP proxy...
>Start-ScheduledTask : Das Argument für den Parameter "InputObject" kann nicht überprüft werden. Das Argument ist NULL
>oder leer. Geben Sie ein Argument an, das nicht NULL oder leer ist, und führen Sie den Befehl erneut aus.
>In C:\Users\matzensv\Downloads\TestDeviceRegConnectivity-main
>(1)\TestDeviceRegConnectivity-main\Test-DeviceRegConnectivity.ps1:26 Zeichen:13
>+ $Task | Start-ScheduledTask -AsJob -ErrorAction Stop | Wait-Job | ...
>+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> + CategoryInfo : InvalidData: (:) [Start-ScheduledTask], ParameterBindingValidationException
> + FullyQualifiedErrorId : ParameterArgumentValidationError,Start-ScheduledTask

### Expected/desired behavior
> running smoothly without erropr messages

### OS and Version?
> Windows 11 Enterprise

### Versions
> what versions?

### Mention any other details that might be useful
> Register-ScheduledTask seems to simply return NULL in this case
> ---------------------------------------------------------------
> Thanks! We'll be in touch soon.