Cannot sign a pdf with my certificate

Hello,

since yesterday , i cannot sign any pdf in acrobat reader (version windows 2023.006.20320).

When i use the "Certificate" tool, then Digitally sign, when i trace the square to put my signature, i get an error message sayning (translated from french) :

"Impossible to create this signature. Informations for support PPKHandlerlmpl-83"

I tried to fix the Reader installation (from help menu). Also tried to uninstall / reinstall acrobat, tired to follow this tip (Erreur de création de signature quand vous signez un PDF (Acrobat 8, 9 sous Windows) (adobe.com)) with no luck. 

Any help would be greatly appreciated !