Does your SSLLABS report say ‘This server’s certificate chain is incomplete. Grade capped to B’?
Concatenate the certificate file with the Intermediate CA.
Open your Certificate file and Intermediate CA in a text editor, copy all of the Intermediate CA file and paste it after the end certificate section.
JOVtnRpn3coVfSR/0rz0XKVXeZGnKztGdIMQhWMTxvZ1UpmRAH2Ab2QnVo1fkPVy qNSJces5Y/VKpIvLBk5Jj55fvK8ME/9ASa+LtLrIms8iYHl75cupuYZZlg8= -----END CERTIFICATE-----
Leaving just the Certificate and the Intermediate Certificate in the file.
Restart your web server and retest in SSLLABS.