OCSP Must-Staple is set
The certificate requires a stapled OCSP response.
Why it matters
Clients that honor Must-Staple will reject the connection if the server does not staple a fresh OCSP response.
What to do
Keep OCSP stapling enabled on the server. This result only records that the certificate asks for it.
Reference
Certificate validity, protocol version, and cipher choice determine TLS trust and strength.