Currently, you must log in to Invoicing and the Business center in general using a work or school email account. We do not support personal accounts. As part of your Office 365 subscription, you will have received another email account, and that’s the one you need to use here.
We realize the confusion that this can bring. For your information, you can set it up so that it’s your usual email account that is used to send the invoices to your customers.

Thank you for your suggestion! We’re planning to make it possible to send your customers a reminder to pay the remaining amount. This will become available next year.

Thank you for your feedback! Microsoft Invoicing is currently available to customers who have an Office 365 Business Premium subscription. We do not currently plan to make the app available in other subscriptions.

Thank you for your feedback!
We are considering adding the option of prices exclusive of VAT. You can create that Expense item and mark it as VAT = 0 and therefore VAT won’t be calculated in this item.
Regarding the manual change of value, we don’t see any good alternative right now as the amount (e.g. travel and accommodation) will be different from one invoice to the other.

Are you still blocked from using your Office 365 mail account?

Thank you for your feedback! We’ve added it to the list of things to consider for a future update since workflows like the ones you describe are relevant to several businesses.

This is indeed a bug that we are working on. We expect to have this fixed in a week or two. But you can add Monaco to the list of countries if you open any of your customers in edit mode – the Country/Region Code field in the customer page does have support for adding a new country or region.

Thank you for your feedback! You’re not the first to suggest this precise scenario, so we’re currently investigating what we can do to help.

Thank you for your suggestion! We’ve added BACS payments to our list of things to consider for a later update, so stay tuned.

Thank you for your feedback! Microsoft Invoicing is indeed currently available to customers who have an Office 365 Business Premium subscription. We do not currently plan to make the app available in other subscriptions.

Thank you for your feedback! You’re right that Microsoft Invoicing has a dependency on your Office 365 work or school account, and that you cannot log in with your personal account. But you have a good point about the experience, so we’ll take a look at what we can do to make it easier for you going forward.

Do you mean attaching a file in addition to the invoice? You can do that in Business center but not on the phone today.

Hello again,
Try this: Create an app password and use that instead. You can see a guide here: https://support.office.com/en-us/article/Create-an-app-password-for-Office-365-3e7c860f-bda4-4441-a618-b53953ee1183

Thank you for your feedback! We’ll add it to the list of things to consider for a future update, but right now we’re not sure if customer groups or similar are quite right for Microsoft Invoicing.

Thank you for your feedback! You might want to sign up for a free trial of Microsoft Dynamics 365 – try it here: https://www.microsoft.com/en-us/dynamics365/financials

Thank you for your feedback! You’re not the first to suggest this, so we’re currently investigating what we can do to help.

Thank you for your feedback, but we are not planning to provide an app for iPad or iPad Pro. Instead, we recommend that you use Business center from your iPad. For more information, see https://support.office.com/en-us/article/Send-invoices-on-the-go-with-Microsoft-Invoicing-98b7c6ea-bb16-45e4-ac9c-59dd0b1e41d5?ui=en-US&rs=en-US&ad=US

We’re not currently planning to include support for personal email accounts.