Outlook 2016 doesn't accept password or app password

I successful enabled a decades-old Hotmail account and several free Outlook.com accounts to Thundebird (102.15.1) using Oath2. I added the account using the regular Thunderbird dialog (FILE > NEW > EXISTING MAIL ACCOUNT) and used my regular password:

An MS Outh2 dialog opened where I again entered the same credentials. Once connected, these are the settings for the accounts:

SERVER SETTINGS:

Server name: outlook.office365.com

Port: Port 993

Connection security: SSL/TSL

Authentication mode: OAuth2

OUTGOING SERVER:

smtp.office365.com

Port: 587

Authentication method: OAuth2

Connection Security: STARTTLS

CONTACTS & CALENDAR

When Microsoft broke things in late January without alerting its users and started this whole mess, I've struggled to keep a stable contacts & calendar connection using TBSync. Only just this week did I finally get a stable connection using the following add-ons:

• Tbsync-4.3-tb.xpi
• Provider for Exchange ActiveSync 4.8.

After installing the add-ins, click on "TBSync: Idle" on the status bar of the main Thunderbird window (in the lower right corner). This opens the "TbSync account manager" window.

1. click Account actions
2. click Add new account
3. click Exchange ActiveSync

The ACCOUNT INFORMATION window will open.

4. choose the Microsoft Office 365 option,
5. give the account a name (see NOTE below)
6. enter your email address.

NOTE: I used an account name without spaces ("HOTMAIL_OAUTH"). For the past six weeks, I tried and failed repeatedly to add this Hotmail account via the Office365 connection. Using an account name without spaces resulted in a successful connection. I don't know if that truly had any impact or if MS finally got its **** together, but I finally got a working connection just this week.

Click "ADD ACCOUNT" and a Microsoft authentication dialog should open. Enter your regular password. You should then be returned to the TbSync account manager where you can enable the resources you wish to sync. NOTE: Be sure to add a value in the "Periodic sync (in minutes)" field.

Hope it works for you. Good luck!

(You'll need it because MS will surely be of no help whatsoever).

For me, the above Thunderbird settings, and TbSync work, all except settings for email outgoing server SMTP.

OUTGOING SERVER:

smtp.office365.com

Port: 587

Authentication method: OAuth2

Connection Security: STARTTLS

When I select OAuth2, I get the SMTP Authentication error:

Only OUTGOING SERVER Authentication Method setting of "Normal Password" seems to work.

Maybe this step

"Click "ADD ACCOUNT" and a Microsoft authentication dialog should open."

failed to appear each time I have tried, as I don't remember it.

Yet another authentication error/couldn't sign on error. Numerous attempts before it accepted. Outlook.com account 9Folders using eas. So damn disappointing.

@Robdstef, @edreded,

Thank you for the information.

I was unable to get OAuth2 to work in Thunderbird 102.15.1 for Microsoft Hotmail/Live accounts as something was wrong with the web page sign in screens closing prematurely, but after many hours spent working on this, I was finally able to get OAuth2 working for Hotmail/Live e-mail addresses using IMAP and SMTP in the latest release version 115.8.1.

It is interesting to note that it also appears that in this version the OAuth2 option is unavailable (for me) using smtp-mail.outlook.com, the server officially listed for SMTP at

https://support.microsoft.com/en-gb/office/pop-imap-and-smtp-settings-for-outlook-com-d088b986-291d-42b8-9564-9c414e2aa040

That said, changing the SMTP Server Name from smtp-mail.outlook.com to smtp.office365.com instead, for my old Hotmail and Live accounts, the OAuth2 option becomes available and seems to work.

It appears Microsoft needs to update the SMTP server listed, and provide better authentication method information, at

https://support.microsoft.com/en-gb/office/pop-imap-and-smtp-settings-for-outlook-com-d088b986-291d-42b8-9564-9c414e2aa040.

I hope my problems are finally over (for now) as this has markedly been a mess.

Don't have a computer to conduct any tests like many (thank you all) access to dos to identify server names to IP addresses. Have any regulars familiar with nslookup tried to enter the MS serve/smtp (IPA) email IP Address (v4) vice name when setting up their profile via control panel? Thanks.