I already created an issue on Github. Please look at:
https://github.com/AzureAD/azure-activedirectory-powershell/issues/24
It seems like a known error as I also found this:
https://social.msdn.microsoft.com/Forums/ie/en-US/81140ed7-29f1-4301-ac8f-3e3f01717e31/powershell-azuread-newazureadmsinvitation-getting-an-object-reference-not-set-to-an-instance-of-an?forum=WindowsAzureAD
and this:
https://stackoverflow.com/questions/49288405/azure-ad-powershell-cloud-object-reference-not-set-to-an-instance-of-an-objec

It would be even better if you could integrate this function into the new Az module.
This function is literally the only reason we have to use the AzureAD module instead of just the Az module.

ctrl/v and ctrl/c displays ^V and ^C instead of doing Paste and copy. Have to use the mouse to paste.

why is Resolve-DnsName not possible in Cloud Shell? Major problem.

Revealed correlation between no response on the job and time spent spending. When there was downtime they spent their time and effort on on using their dollars in exchange for time and effort they could earn to have what they spent their dollars earned with their time and effort earning. Their time and effort was spent on spending their time and effort on spending.

Cloud Shell: MSOnline and ExchangeOnlineManagement modules do not work.

Today, we don't have the ability to add AzureADPreview modules to Cloud Shell. Could we have the ability to add these?

Requesting a Cloud Shell.Failed to provision a Cloud Shell: {"code":"TenantActiveUserQuotaReached","message":"Tenant '604c1504-c6a3-4080-81aa-b33091104187' has '306' active users in location 'westus', which exceeds the active user quota."}

Please support the consolas font in Azure Cloud Shell

error message:
Requesting a Cloud Shell. Sorry, your Cloud Shell failed to provision. Please retry later. Request correlation id: UKSOUTH2

any idea (I have tried later ... without success)
thanks

MSOnline Module is not working in the shell. Some commands like Get-MsolDomainFederationSettings are only available in this module. This module should be allowed to work. The cloud shell says the module is installed and imported however the commands are not recognized.

It would be awesome to be able to write script / look at all the command option with some sort of ISE integration.

System.Management.Automation.CommandNotFoundException: The term 'Get-MsolGroup' is not recognized as the name of a cmdlet, function, script file, or operable program

How to get this running ?

please help

Text not visible.. but cursor is active and we can do copy paste. The screen is just blue color and nothing in it

Currently you only seem able to store/execute scripts from your user HOME directory. Ideally we would like to have shared folders with scripts/data that you can CD into (just like you would in Windows) and execute in that context

ALlow PASTE into cloud shell. Its really annoying that the "TRY IT" on this page: https://docs.microsoft.com/en-gb/azure/governance/resource-graph/concepts/explore-resources

have to be manually entered. Why doesn't PASTE work (it should find the plaintext version of the paste buffer by default)? In Chrome, only PASTE AS PLAINTEXT works. In Edge, forget it.

Cannot connect to cloud shell for training due to quota:

Requesting a Cloud Shell.Failed to provision a Cloud Shell: {"code":"TenantActiveUserQuotaReached","message":"Tenant '604c1504-c6a3-4080-81aa-b33091104187' has '300' active users in location 'westus', which exceeds the active user quota."}