With a Office 365 Business Plan subscription, its asks for a tenant domain and an onmicrosoft name. What is it, and why do I need it?

I ordered a new Dell laptop, and selected Office 365 Business Plan.  
I received an email containing the information below:

Your order of Office 365 (Office 365 Business) subscription will be
automatically cancelled if this information is not received by 03/11/2019.

Please click the link below to provide information regarding the Microsoft

We require additional information to complete the order for your subscription. This information must be received by 03/11/2019 to avoid order rejection.

1.  Do you wish to create a new Tenant Domain or use an existing Tenant

Domain?
Example: companyx.onmicrosoft.com ?
_ New Tenant Domain     _Existing Tenant Domain


2.  What is the Tenant Domain you wish to use?
The Tenant Domain must always end in ".onmicrosoft.com".  

We have Windows Server 2016 on premises, and Exchange Server 2016 on premises.

How do I respond to those 2 questions?
eemmpphAsked:
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JohnBusiness Consultant (Owner)Commented:
I have to ask: If you are unaware of these requests for information, do you really need the Business Plan?  Are you associated with a business that needs this?  That would be your answer to the second question.

Otherwise the Office 365 Home (very complete package) may be what you need.
eemmpphAuthor Commented:
I know for sure that I, and my co-workers need Office 365 Business subscription for $99 per year, per user.

I do not know the answer to the questions below.  We are replacing our existing Windows 7 computers, running various versions of MS Office, with Windows 10 professional computers and Office 365 Business.

1.  Do you wish to create a new Tenant Domain or use an existing Tenant
Domain?
Example: companyx.onmicrosoft.com ?
_ New Tenant Domain     _Existing Tenant Domain


2.  What is the Tenant Domain you wish to use?
JohnBusiness Consultant (Owner)Commented:
2.  What is the Tenant Domain you wish to use?

That is the email system you are using with your co-workers.

You must have got this on sale.

Office Home is $109
Office Home and Business is $199
Office Premium is $169
Exploring SharePoint 2016

Explore SharePoint 2016, the web-based, collaborative platform that integrates with Microsoft Office to provide intranets, secure document management, and collaboration so you can develop your online and offline capabilities.

Jackie Man IT ManagerCommented:
2.  What is the Tenant Domain you wish to use?

Most businesses have its own domain for email. For example, your email address is myname@mydomain.com instead of the free Yahoo mail, Gmail... etc.
Karen FalandaysTraining SpecialistCommented:
Are you setting this up just for yourself or for your organization? See if you have access to these setup guides:

https://portal.office.com/AdminPortal/Home#/SetupGuidance

Additionally , contact O365 support with your questions. They are very responsive
eemmpphAuthor Commented:
The link to the Microsoft Office Business Plans are located here:

https://products.office.com/en-us/compare-all-microsoft-office-products-b?tab=2&OCID=AID737190_SEM_q0VrjzQ8&MarinID=sq0VrjzQ8|250577072328|office%20365%20business%20plans|e|c||55539102361|kwd-300963225796&lnkd=Google_O365SMB_Brand&gclid=EAIaIQobChMI0c3R4MTw4AIVxLfACh2kng-cEAAYASAAEgJhqPD_BwE

Office 365 Business - This is my choice
Office 365 Business Premium - This is NOT my choice
Office 365 Business Essentials - This is NOT my choice

Here is the image of it:

Office 365 Business Plans
JohnBusiness Consultant (Owner)Commented:
So go ahead with that and for Outlook use your own mail settings
eemmpphAuthor Commented:
When I click on this link:

https://portal.office.com/AdminPortal/Home#/SetupGuidance

I get this error:

You don’t have permission to access this page or perform this action.
eemmpphAuthor Commented:
We have Windows Server 2016 on premises, and Exchange Server 2016 on premises.  How do I respond to the 2 questions below:

1.  Do you wish to create a new Tenant Domain or use an existing Tenant

Domain?
Example: companyx.onmicrosoft.com ?
_ New Tenant Domain     _Existing Tenant Domain


2.  What is the Tenant Domain you wish to use?
The Tenant Domain must always end in ".onmicrosoft.com".  

We have Windows Server 2016 on premises, and Exchange Server 2016 on premises.
JohnBusiness Consultant (Owner)Commented:
You need active Office Account for that page. It works for me (my account) . Since you purchased a subscription you should have an email from Microsoft with log in information
Karen FalandaysTraining SpecialistCommented:
Hi eemmph,
You need to coordinate with your tech support or Microsoft. If you buy O365 enterprise, you want to make sure you are connected to your organization's system. It sounds like you are buying your subscription in a vacuum.
Do others in your company already have a subscription?
eemmpphAuthor Commented:
I am only purchasing Office 365 Business (not Premium, not Essentials, not Enterprise).

My new Dell laptop is the test platform.  Eventually 19 others in my company will follow.  As I replace there Windows 7 computers with Windows 10 computers, I will purchase Office 365 Business subscription accordingly.

One of my co-workers went ahead and purchased a new Dell laptop along with Office 365 Business.

Now both of us received an email, with the same 2 questions.  Which means, 17 others will get the same email.

So, I am trying to figure out how to answer the 2 questions correctly.

for myself, as the 1st person, I would think to respond:
For question 1, I would choose "New Tenant" Domain
For question 2, I would choose mycompanyname.onmicrosoft.com

for my co-worker, I would think to respond:

For question 1, I would choose "Existing" Tenant Domain
For question 2, I would choose mycompanyname.onmicrosoft.com
JohnBusiness Consultant (Owner)Commented:
Just use the settings in your outlook. That is your number 2 question. You are a tenant of your email supplier. Question one does not apply to you
eemmpphAuthor Commented:
Hi John, this has nothing to do with Outlook at all.  It seems Microsoft wants Office 365 Business users to supply answers to the two question, prior to allowing the software to be downloaded to the computer.

If I would just answer the 2 questions, Microsoft would allow me to download Office 365 Business to my new laptop.
JohnBusiness Consultant (Owner)Commented:
Q1 does not apply (n/a)

Q2 is your current email Domain
eemmpphAuthor Commented:
I beleive this is how they control the number of times the software is downloaded to a device.  "Business" users can download the software to up to 5 devices as long as the user credentials are the same.  "Home" users can download to 5 devices with unlimited users.
JohnBusiness Consultant (Owner)Commented:
Yes and so once you answer and give your email, they will give you a password or show you how to get it and then you need this for each and every Install
Karen FalandaysTraining SpecialistCommented:
Your tenant domain will be your company name @onmicrosoft.com. If no one else has responded, then this is a new tenant domain
Once you are set up, you can have everything diverted to your own domain if you like.
For example, I am licensed to pcresource.onmicrosoft.com but I have email and websites for PCResource.biz.
They can all work seamlessly together once you are up and running

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JohnBusiness Consultant (Owner)Commented:
That may be unique to the particular Subscription. I have an Office Subscription and it is not tied to a Microsoft Domain

Moral- Never buy any computer with Office preinstalled. Too much needless aggravation
eemmpphAuthor Commented:
Thanks for your help, I greatly appreciate it.
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