Our users all have Office 2016 (365 subscription version). We have our own internal MS certificate authority with signing certificates issued to each user.
I have a document in Word with 2 signature fields. One person signs it with their certificate, sends it to another user, and then that user signs it.
For the first user everything goes fine.
But when opening the document for the second signature, or when opening the final document signed by both, the signatures don't appear. I can open the signatures tab, and it sits there saying "Verifying signatures..." for 2-5 minutes. The signatures all show as being valid, and if I click the signature boxes after that the signatures appear.
Google searches reveal some people having these problems for really old versions of word but nothing about 2016.
As far as I can tell, all the certificates are fine. The root and sub CA certificates are installed on the machines and trusted. CRLs and OSCP are accessible and working.
Anyone encountered this before or can think of anything I can try? Or is Office just realy bad at handling digital signatures?