Microsoft 365 Email will not stay connected to Thunderbird via IMAP
Working with an end-user who has 2 365 mailboxes in Thunderbird using IMAP, but after repeated configurations and removal/readdition of accounts, are still met with the following error notification: "The current operation did not succeed. The mail server for account xxxxxxxx responded: User is authenticated but not connected."
Thunderbird is up-to-date on version 102.6.1(64-bit). We have connected the accounts using default settings for IMAP and 365 mailboxes. It did work for a short period of time, then stopped syncing and producing error. We have disabled security defaults in Exchange Admin Center, and MFA is disabled as well.
Any help would be appreciated.
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We are getting some reports that MS365 seems to have a problem with ipv6
Please try:
- Menu icon > Settings > Genreal
- Scroll to bottom and click on 'Config Editor' button
- It opens in new tab.
- In top search type :ipv6
- look for this line: network.dns.disableIPv6
- By default it iset to 'false'
- click on the far right icon to toggle this to 'true'
Restart Thunderbird.