I am just playing around with a new freePBX-16 installation. I did install ImageMagick and therefore had to change php version 7.4.16 to 7.4.28, but this seems not to be the cause of the problem.
When I run a debug on a CID-Superfecta scheme, I received an error in line 191 (source-LDAP.module). The LDAP-lookup didnt work. This seems to be a problem caused by any 7+ php version, it’s about a non-numeric value…described here
Accordingly I changed line 191 in the source LDAP module from
$thenumber = substr($thenumber, (-1*$run_param[‘Filter_Length’]));
to
$thenumber = substr($thenumber, (-1*(int)$run_param[‘Filter_Length’]));
…now it seems to work