bug#38142: Evolution: e-mail wizard fails due to missing service file

[Sam]

Hello,
evolution, the gnome e-mail program, currently (3.30.5) is not able to 
add an E-mail account ootb. The set-up works fine until the very last 
moment, when the configuration is supposed to be saved.
When the finish button is pressed, this error message appears:
"The name org.gnome.evolution.dataserver.Sources5 was not provided by 
any .service files".
NixOS had a the same error, but somehow managed to fix it: 
https://github.com/NixOS/nixpkgs/issues/12756 in this patch: 
https://github.com/NixOS/nixpkgs/pull/17926.
However, I am not sure how to translate this fix to Guix.
If I can somehow help with this bug, please let me know.

Thank you,
Sam