kdepim-runtime is compiled with XOAUTH2 support, which produces libkdexoauth2.so, libkdexoauth2.so.3 and libkdexoauth.so.3.0.0 files. This is a SASL2 plugin and SASL2 looks only for "*.so" names (without soversion). kdepim-runtime does not include this file, so SASL2 does not load the XOAUTH2 plugin, which breaks Gmail login for all users. Most probably affects Dev stable and Dev unstable too.
I can confirm this - found this morning after upgrading neon/user that 'saslpluginviewer -c' does not list kdexoauth2. After creating a symlink manually, # cd /usr/lib/x86_64-linux-gnu # ln -s libkdexoauth2.so.3 libkdexoauth2.so kmail started working normally with GMAIL again
fix is building
This has reoccured with KDE 6 release. I had to create the symlink manually.
Also kpim6-libsasl2-modules-kdexoauth2 package was not installed during upgrade and I had to install it manually.
Thank you for your bug report! However this bug report was created/provided previous to 01/01/2023 and also has not received any updates since before 01/01/2025. Unfortunately KDE neon no longer provides updates for anything older than noble 24.04 based edition's. Please upgrade to KDE neon noble and if you can reproduce the issue after upgrading to an active version, feel free to re-open this bug report. Thanks for understanding!