Unable to subscribe to Office 365 IMAP folders from MUA since 2022-11-01

Anonymous

I'm using Thunderbird to access my Office 365 mail account and it has been working fine (a couple of month ago I also switched to OAuth2 due to deprecation of basic IMAP authentication). However, since 2022-11-01, Thunderbird is unable to subscribe to IMAP folders. Last time I know it was working was last Friday 2022-10-28. Thunderbird is able to list to available folders (e.g. when opening the "Subscribe" dialog from the mail account settings), but cannot subscribe to them. I enabled IMAP logging in Thunderbird, and it shows that the server answer the subscribe request with "BAD SUBSCRIBE".

It is not a password/authentication issue, as Thunderbird can still see the content of "Inbox" and "Deleted Items". And if I disable the option "Show only subscribed folders", it can access everything in my Office 265 account.

Edit: here's the relevant logs from Thunderbird (note: I've replaced the actual folder name with "xxxx"):

[Parent ...: IMAP]: I/IMAP ...:outlook.office365.com:A:SendData: 76 subscribe "INBOX/xxxx"

[Parent ...: IMAP]: I/IMAP ...:outlook.office365.com:A:CreateNewLineFromSocket: 76 BAD SUBSCRIBE failed.

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Anonymous

2022-11-21T13:50:08+00:00

Just to confirm, the issue is not just with Thunderbird, but also with Gnome evolution,

with the error message: Error fetching subscribed folders: LSUB failed.

So it seems to be definitely not the MUA.

I get the same error (LSUB failed) using Vivaldi Mail. Whether I log in using a password or OAuth does not make any difference. I am not the only one having the issue, see https://forum.vivaldi.net/topic/80723/lsub-failed-with-office-365-imap-server
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Anonymous

2022-11-20T17:35:55+00:00

Thanks - added that to my ticket.
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Anonymous

2022-11-18T09:26:22+00:00

We get the same error using Horde IMAP Client: IMAP error reported by server., LSUB failed.
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Anonymous

2022-11-18T09:18:31+00:00

Well, we didn't find a workaround on the native apple mail client for IOS or macOS,

Our Client also uses EGroupware, which uses a Mail-Client based on "Horde IMAP Client".
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Anonymous

2022-11-17T20:39:20+00:00

It's not a product I'm familiar with, and I didn't pick that point up from your earlier posting. Thanks.
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