Not sure what you're using for MFA (I'm on oama to M365) but every now and
then errors a bit similar to this mean I need to re-authenticate the token
(oama authorize microsoft [email address], in my case).

Best wishes
Marton

On Thu, 18 Dec 2025, 07:51 Stephan Windmüller via isync-devel, <
[email protected]> wrote:

> Hello,
>
> my setup of mbsync suddenly stopped working with this output:
>
>
> % mbsync -a
> C: 0/1  B: 0/0  F: +0/0 *0/0 #0/0 -0/0  N: +0/0 *0/0 #0/0
> -0/0[SASL-XOAUTH2] - Requesting authID!
> [SASL-XOAUTH2] - Requesting token!
> [SASL-XOAUTH2] - filling prompts!
> [SASL-XOAUTH2] - Requesting authID!
> [SASL-XOAUTH2] - Requesting token!
> Error: IMAP wants more steps despite successful SASL authentication.
> mbsync: drv_imap.c:2033: imap_free_store: Assertion `!ctx->pending &&
> !ctx->in_progress' failed.
> [1]    10495 IOT instruction (core dumped)  mbsync -a
>
>
> I know it sounds silly, but it seems that this happened right after
> installing a KDE desktop and its dependencies. mbsync runs every 20 minutes
> and the first core-dumps were generated right after those packages were
> installed. No packages were upgraded in this process.
>
> Do you have any advice on how to fix this?
>
> Best Regards
>  Stephan
>
>
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