GPG Key extraction failed SplitGPG Thunderbird

keyextractionfailedthunderbirdsplitgpg

It only attaches my signature but not the public key part. But i have chosen to do so. Does someone know how to fix this issue?

Have you try read this?

Yes, i have done so.

Sry im just stupid. I entered sub key id and not primary key id
Thank you for patience