Why does a digital signature with a CA certificate not validate in adobe reader

My client has adobe reader and can not validate a digitally signed document which has a CA certificate which normally appears in the adobe root store.  it comes up that one of the signatures have problems when he signs.  when i email him a document that i sign it validates the signature.  his signature validates on my side.

Did you find any solution for this problem?
i'm trying to implement something similar but i don't know how.
thanks in advance!

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