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"User is authenticated but not connected" when trying to use ThunderBird as mail client access office365 after confirmed below:
@YuWenshan-Nokia Thanks for posting in our Q&A. For this issue, it is not related to intune. To get more accurate help, I will add office-exchange tag. Let's wait for the related support engineer involved in this issue. Thanks.
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Hi @YuWenshan-Nokia
Are you using the default autodiscover feature in Outlook to connect to Office 365?
If yes, would it work if you configure SMTP and IMAP with the same settings as thunderbrid in Outlook?
Hi, KaelYao
thank you for checking this topic
when I use OUTLOOK, it just asked me my mail address then server was configured automatically, and it was done successfully (I did not set server address nor port);
but for Thunderbird client, I got same error message by either automatically configuration and manually doing.
please, as first step, have a check on my configuration (done by manually) pasted in question. Is correct or not?
BR
Wenshan
Hi,
Thanks for the update!
when I use OUTLOOK, it just asked me my mail address then server was configured automatically, and it was done successfully (I did not set server address nor port)
Outlook should be using the autodiscover feature and the protocol is MAPI.
please, as first step, have a check on my configuration (done by manually) pasted in question. Is correct or not?
In the screenshot you are using OAuth2 as the authentication method.
Have you configured it on the Office 365 side?
Reference: Authenticate an IMAP, POP or SMTP connection using OAuth
If not, would you like to use basic authentication (username and password) to access the mailbox in ThunderBird?
Hi,
Actually it does not work for all authentication ways, but Oauth2 has closest target, results for your information:
Basic password
Encrypted password 
Kerberos / GSSAPI 
NTLM 
TLS 
Oauth2 
I remember that one of my colleagues were using Oauth2 for Thunderbird before, but unfortunately he has left company.
as for Authenticate an IMAP, POP or SMTP connection using OAuth, it looks to complex to me due to I am not a technical guy, do you have some simpler instruction or troubleshooting steps?
Hi,
Please kindly note that:
Since thunderbrid is a third-party email client, which we are not very familiar with, I would recommend also posting in thunderbrid support forum if you are having trouble with configuring accounts on thunrderbrid.
(Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.)
Thanks for your understanding.
Here are the steps I configure my test account in thunderbrid(same version 91.8.1(64-bit)):
1.In my test the General.UserAgent.CompatMode.Firefox isn't necessary so I skipped this step
2.select ...>New>Existing Mail Account
3.enter the name and email address(Office 365),leave the password as blank
4.thunderbird auto-detected the settings of Office 365 server
It it didn't, you may also configure it manually:
5.After the account is configured, you would be prompted for password, select Cancel:
6.click Account settings
locate Server Settings, change Authentication Method to OAuth2
In advanced, uncheck the field of show only subscribed folders
locate Outgoing Server(SMTP), also change the Authentication Method to OAuth2
7.back to the main page, click Get messages
You would see a Microsoft login pop-up
enter the password of your account, if your account have MFA enabled, step forward to authenticate.
Once you authenticate successfully, you would see this page:
click accept.
8.test send and receive
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Hi @YuWenshan-Nokia
Do suggestions above help?
If any update on this issue, please feel free to post back.
Hi @YuWenshan-Nokia
Please follow the steps in this link and see it it works for you:
Configuring Exchange Online with IMAP & OAuth2
(Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.)
When you configure the mail account, please leave the password field blank.
Later change the authentication method to OAuth2 in Server Settings and Outgoing Server(SMTP).
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
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Hi @YuWenshan-Nokia
Just checking in to see if above information was helpful. Please let us know if you would like further assistance.
Hi, @Kael Yao-MSFT
thank you for checking. looks progress is not so food...
according to mentioned instruction, I got :
Tenant ID
<tenant ID>
Application ID
Thunderbird 08162f7c-0fd2-4200-a84a-f25a4db0b584
then the link is https://login.microsoftonline.com/<tenant ID>/oauth2/authorize?client_id=08162f7c-0fd2-4200-a84a-f25a4db0b584&response_type=code&prompt=admin_consent
but result is "Need admin approval":
is it excepted?
if yes I should contact IT of my company?
Hi,
Yes. You may need to access the url with an administrator account.
Hi, @Kael Yao-MSFT
confused, do you mean the administrator account has to do it one by one for everyone who wants to use Thunderbird?
asked as some colleagues have been using Thunderbird for a while, and I guess not possible to ask administrator account to do it one by one for a company with tens of thousands of people
any misunderstanding?
do you mean the administrator account has to do it one by one for everyone who wants to use Thunderbird?
No. It isn't necessary.
If you configure your mailbox in thunderbrid, after you authenticate would you be prompted like:
Hi,
I think I have configured my mailbox in thunderbrid, refer to topside question content pasted of server configuration, any mistake there?
if no, how could I authenticate to be prompted as permission request same as you pasted? looks this is the point to solve my case
I think I have configured my mailbox in thunderbrid
Can you get the existing emails in thunderbrid and send emails successfully?
If not, please trying removing the existing account and re-adding the account, follow the steps in the link (leave password as blank): Configuring Exchange Online with IMAP & OAuth2
(Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.)