I am a Mac user running on OS X El Capitán vers. 10.11.14 who just installed the Adobe Acrobat Reader DC program so that I could sign ACA (Autoridad de Certificación de la AbogacÃa -Spain-) documents. When I attempt to sign these documents using my ACA certificated (common access card) via my smart card reader, I get the error message: "the credential selected for signing is invalid". My ACA credentials should not be the issue, as I've used it on work computers without signature problems, so I'm thinking that the issue i'm getting on my Mac is related to my current Adobe settings. Any advice or assistance in regards to signing documents with my ACA card would be greatly appreciated. Hopefully, I can get some real assistance instead of a generic copy and paste "trouble shooting" response. Thank you
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