Prefix handling not valid

Hallo,

i have test the certificate https://www.ssllabs.com/ssltest/analyze.html?d=anzahcloud.de

now i get the message:
Prefix handling Not valid for “anzahcloud.de” CONFUSING

Can anyone say me how i can fix this please?

Your certificate should at least include www.anzahcloud.de as alternative name, because many users still prefix everything with www.

How i include www.anzahcloud.de in anzahcloud.de certificate?

How did you issue that certificate with that “happy hacker fake CA”?

I have use this instructions and this command

./letsencrypt-auto

If www.anzahcraft.de and anzahcraft.de are the same server, you can use the command-line -d flag to request a certificate for multiple names, eg:

./letsencrypt-auto auth -d anzahcraft.de -d www.anzahcraft.de

When being asked for the domains, just add it as another domain.

I have both domains created seperately (anzahcloud.de and www.anzahcloud.de) and get the message

Put them into a single certificate to resolve the issue.

i try but i havent know how i do this

ok this command run fine

//EDIT
must i update the cert with the same command?