2.3.2.1 - EC keys suppport?

[ѽ҉ᶬḳ℠]

Hi,

facing [ no shared cipher ] error with EC private keys. This happens
when the private key is generated with [ openssl ecparam -name
brainpoolP512t1 -genkey ] with OpenSSL 1.1.0hh on the same machine
Dovecot is running on.

Tried some variations of [ ssl_cipher_list ] but to no avail - the [ no
shared cipher ] error persists.

Once the key is generated with [ openssl genpkey -algorithm RSA ]
however the error is gone.

Thus wondering whether (1) I am missing something or (2) this a bug or
(3) there is no support for EC keys?