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Can't Send Email with Office365 Account

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So after browsing the support page I find a help article that runs through a bunch of steps to fix this issue and then says: If this list doesn't help, Please create a new support request (with a link to create a support request). It's only now occurring to me that "create a support request" really just means create a forum post. Is there really no legitimate way to create a help ticket?

Thunderbird will receive and, after some excessive work on my part, has migrated all existing folders over to the interface. However, I am unable to send any emails using this email address (other linked mailboxes work fine). This is an office365 email address provided by my university, passwords are correct even though TB tells me they are not, and all settings seem to match required settings. There is at least one thread on your support page from 2020 that has the exact same problem as me; there are several people suggesting different solutions but since this email was set up by the university and I'm not an O365 admin, none of the solutions apply to me. Is there a solution that doesn't involve O365 admin access for this type of account? (Also 2FA does not apply to this mailbox if that's relevant and the user ID/name not included in the screen shot is my full email).

I'm using Windows 10 and current TB version is 102.6.1 (64-bit). SMTP setting are attached as a screen shot.

So after browsing the support page I find a help article that runs through a bunch of steps to fix this issue and then says: If this list doesn't help, Please create a new support request (with a link to create a support request). It's only now occurring to me that "create a support request" really just means create a forum post. Is there really no legitimate way to create a help ticket? Thunderbird will receive and, after some excessive work on my part, has migrated all existing folders over to the interface. However, I am unable to send any emails using this email address (other linked mailboxes work fine). This is an office365 email address provided by my university, passwords are correct even though TB tells me they are not, and all settings seem to match required settings. There is at least one thread on your support page from 2020 that has the exact same problem as me; there are several people suggesting different solutions but since this email was set up by the university and I'm not an O365 admin, none of the solutions apply to me. Is there a solution that doesn't involve O365 admin access for this type of account? (Also 2FA does not apply to this mailbox if that's relevant and the user ID/name not included in the screen shot is my full email). I'm using Windows 10 and current TB version is 102.6.1 (64-bit). SMTP setting are attached as a screen shot.
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Thank you for the reply! Unfortunately that is very much not my problem. Tested this method with no success. Added a couple additional screen shots after this method was tested. Although to be honest the linked thread isn't actually relevant to my particular issue. I have full access to all linked inboxes (I have yahoo, gmail, and university email accounts) for read/receive purposes. I can also send mail from all but one inbox which is the one i describe above.

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Unfortunately, you might have to contact the O365 admin. at your school to see if smtp access has been enabled. This is not something that can be done by account users.

But since most FSU support pages suggest the account should be accessible as you have set it, I wonder if a 3rd-party antivirus such as Avast/AVG is interfering. Is this relevant in your case or is there some other factor like a VPN in play?

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Again, thank you for the reply! I actually considered reaching out to the FSU IT department but since that's a cumbersome process I tried to do as much troubleshooting as possible first.

I checked all the FSU IT pages and confirmed I am set up as instructed. Also, this has never been a problem with the native windows email application. I'm able to send emails from this account using TypeApp mobile from my android phone which similarly allows for multiple mailboxes to be managed in a single interface. I do use a VPN but when I first encountered this problem I disabled the VPN to test it and I was still unable to send anything from this account. I don't use 3rd party antivirus software; I use the Windows Security that came with the OS.

So far I've: checked/reset all SMPT settings turned off my VPN added an exception through the firewall for Thunderbird tested sending emails with the actual FSU email application tested sending emails on the same computer using a different application (Windows Mail) tested sending emails with another application on a different device/OS (android OS) read all available articles on this topic (why are there so many?)

In all test cases I was able to send emails just fine. This leads me to believe this is not an FSU IT problem, OS problem, VPN problem, or firewall problem; this appears to be application-specific in that Thunderbird is the only application of the many email applications I have access to that won't send emails from this account. Since this is a Mozilla support page I was hoping for some Mozilla-specific solutions. I realize there are some standard troubleshooting steps to run through but it seems everything that's published in an article or suggested on a forum is about the user fixing something/employing a workaround.

Honestly all I wanted was an email application that let me manage all my inboxes in a single interface. The native Windows app did well enough but left a lot to be desired. Outlook is the bane of my professional existence so I was hoping Mozilla would provide relief. Perhaps I'm asking too much of a free program.

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Given there are several departments at FSU with explicit instructions for using TB, I rather doubt the app itself is at fault. Instead, there is probably something unique about your system that is the cause of failure. Try running Windows in safe mode to test for the effect of startup apps, among other factors, and add the TB profile folder as an Exclusion in Windows Security settings. Try adding the account to a new, unmodified profile, from Help/More Troubleshooting, about:profiles. The VPN might have changed TB's proxy or other settings that persist when the VPN is 'disabled'.

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I appreciate you taking the time to try to help me out here, thank you. The reality here is that Thunderbird doesn't work on a standard Windows 10 OS to send emails from an exchange account. If the solution is for me to go deep into computer settings to change the machine to allow the program to work, it's just not a program I'm going to continue to use when the native email application works just fine. If I'm comparing free software, the free software that came with the computer is working but the software I downloaded from Mozilla does not function as intended. Perhaps if I was a computer scientist with the patience to reconfigure my entire machine around one application this would work but I'm just a lowly aerospace engineer and I think we've reached the end of my willingness to work around the issue. The solution to this problem is to simply not use this software. Never thought I'd say this, but chalk up a win for Microsoft I guess lol. Thanks again for the help, I really do appreciate the effort. It just really shouldn't take multiple days and a forum chat to get email to work (and we didn't even get it to work).