Error signing and encrypt

Why do i get this error
```
- ERROR openpgp: invalid argument: cannot encrypt a message to key id
******************** because it has no encryption keys.
```
If i only sign or encrypt all work. But if i use encrypt and -s
i get the error.

Exemple:

```
PS C:\Users\hosso\Desktop> keybase pgp encrypt max -s -m "secret"
- ERROR openpgp: invalid argument: cannot encrypt a message to key id b9faeb3bd825a769 because it has no encryption keys
PS C:\Users\hosso\Desktop> keybase pgp encrypt max -m "secret"
-----BEGIN PGP MESSAGE-----
Comment: https://keybase.io/download
Version: Keybase Go 4.2.0 (windows)

wcFMA9uMFCydhQrEARAAIQ055+Dm6SoPuqMVFgZm8UX/2RwEWnmqBzx30OYfSTTv
qPbGaormW/st6VedESh0u4+meGWnAxQ4FA8J7sm+IRuYazZCU1nVApULYXnfXtD0
8EpArb91UDNxdnv6rqkIjnFO1m1ixj2rQrz/XWWphab/125dSCpRrknkfg42N06n
OPeeIiPKCZA4LieBZItBgittDZ7gB0j7lANcny1VuuUxYKFc83wbvd2mmd2e4b7C
7R6MFkO0Ephbb/ezEU3Se/oiUsr0Oo8zx/DDxsONnVgbR4/1EGRf2yLRWs0bI5Yq
tFzSoYSCkdISf53bazNZrqIL3lkrGZptTcq8lggQ/AuUGvJGZHCMQBk4xKCcjO23
qlDiZ/S7NuaCutepi0zxCOZKKyCR9zHPuNOJhlRDgvbLN0F3JNItUwKMzc9kNuDr
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mUPDxxiDrbsGQdg4eRg4Fj5XHpLeCh7ykHv3R6iMrR7zNXz2L4NEtf7oOY0ff+7B
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bTfSs7hDHpnp6gBgUmmfqU8sgyQiWzzgUYiDk7tiRi6ekSNA1470Eztc7SR54IhZ
OQMGhyrLXtNDd/z7IqV4randrcLKdEJ6GRvfP1zVXM3DmqUrERPxaGvsg0O/ncng
1TRoUecmKZX9OPQxGdfQFreuRlWGIx3ryEIRfXKA3oPTz6bxYeJGA4Hj/QxSyIp0
e9th33By0kJBPjGsiEZiE+D9UVPlj24KmsDboorDhNLgAeRyApCMLcBmu843u1ec
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QhAS4uFysoXhCvUA
=QCTV
-----END PGP MESSAGE-----
PS C:\Users\hosso\Desktop> keybase pgp sign -m "secret"
-----BEGIN PGP MESSAGE-----
Comment: https://keybase.io/download
Version: Keybase Go 4.2.0 (windows)

xA0DAAoRufrrO9glp2kBy+F0AOIAAAAA4nNlY3LhZXQAwkYEABEKABAFAl0yR6wJ
ELn66zvYJadpAABlegCgAxTnHjOig6v/OIRHuIsH6yjyOD8AoIgkS9qMamNPnhyd
E8akSfO9b8hX
=6Zhx
```
But if i use encrypt -s to myself all work fine and i also can use keybase.io sign and encrypt in the browser.. On the website i can sign and encrypt to max..
my log id: ff8735b68667f0d64b34191c

Start by reproducing the reported `keybase pgp encrypt max -s -m "secret"` command and compare it with signing or encrypting separately, including the successful self-encryption case. Use the supplied log ID when investigating; done means determining whether the recipient key's capabilities or the CLI combination causes the error and documenting or correcting the behavior.

Written by the indexing model from the issue text.