Why is the private key of the ssl certificate not loading in cpanel?

Question

Network administration

Can't upload private key for ssl certificate in cpanel.
Spits out an error.

The system was unable to store the private key for your account. The key could not be processed. Please make sure it is in the correct format.

Checked on Apache 2.4 - everything is ok.
Key with passphrase.
What can be wrong? It is necessary to put a certificate on the site, but here such nonsense.

Answer 1

The solution is to decrypt the key.