Failed to Generate Cert / Invalid Configuration

Hello! I am seeing errors for my project's domain name: diklein.com. I am using Digital Ocean for nameservers and I have the following records:

A record:

CNAME record:

Hostname: www.diklein.com (this is what appears when I enter www)
f914267238babbc0.vercel-dns-016.com (the period after com is automatically removed by Digital Ocean)

For diklein.com (Production) I see the error "Failed to Generate Cert."

For www.diklein.com (308 to to diklein.com) I see the error "Invalid Configuration."

What am I doing wrong here?

Update: diklein.com is working.

www.diklein.com is still showing "Invalid Configuration."

Hello! I am seeing errors for my project's domain name: diklein.com. I am using Digital Ocean for nameservers and I have the following records:

A record:

CNAME record:

Hostname: www.diklein.com (this is what appears when I enter www)
f914267238babbc0.vercel-dns-016.com (the period after com is automatically removed by Digital Ocean)

For diklein.com (Production) I see the error "Failed to Generate Cert."

For www.diklein.com (308 to to diklein.com) I see the error "Invalid Configuration."

What am I doing wrong here?

Update: diklein.com is working.