Power Bi demo to client

I've tried to do the same with my business E-Mail Id but it redirected to me to my companny authorized mail. I'm not sure will it be legal or am I authorize to register by myself. 

When I tried to login with my client generated E-Mail id: (ex.: [email protected]) I am getting redirected to another page which says

This system is restricted solely to XYZ authorized users for legitimate business purposes only. 
The actual or attempted unauthorized access, use, or modification of this system is strictly 
prohibited by XYZ. Unauthorized users are subject to Company disciplinary proceedings and/or 
criminal and civil penalties under state, federal, or other applicable domestic and foreign laws.
The use of this system may be monitored and recorded for administrative and security reasons. 
Anyone, accessing this system expressly consents to such monitoring and is advised that if 
monitoring reveals possible evidence of criminal activity, XYZ may provide the evidence of 
such activity to law enforcement officials. All users must comply with XYZ Corporate 
instructions regarding the protection of XYZ information assets.

Now, when I login with my company email account (Ex: [email protected]). I am getting below message

We don't recognize this user ID or password
Be sure to type the password for your work or school account.

Now, still in this case will my company be charged or will get notification if I tried to get registered? This is quite depressing as I just want to do a simple demo to my client to make him understand how he can take advantage of Power BI. I'm sure I can encourage him to invest in it.

Nevertheless, alternatively is there any way that I can use ASP.NET or SharePoint as a host insted of Power BI online services?

Currently, I have used "Power BI desktop" so I connected to my local SQL Server database but I am open to deploy the same on Azure for showing this demo. As it is fairely small, my .pbix file size is < 3 MB.

Any advice or assistance would be appreciated.