I obtained a .p12 file from my employer for its internal public key infrastructure that should allow me to sign, encrypt and decrypt emails. I have installed it as a profile on my iOS device and can now successfully sign and encrypt emails, however, the Mail app says I need to install a profile (which I already have) before I can decrypt emails (doesn't work in the Outlook app either). Per my understanding the requirements for being able to encrypt and decrypt emails are exactly the same – how is it possible that I can do one but not the other?

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