Did you enable the CAM ?
Reenabled a system with an DD CA. The CA can be used - but there are some issues:
[ 9.025329] dvbdev: DVB: registering new adapter (DDBridge)
[ 9.025332] dvbdev: DVB: registering new adapter (DDBridge)
[ 9.025333] dvbdev: DVB: registering new adapter (DDBridge)
[ 9.025334] dvbdev: DVB: registering new adapter (DDBridge)
[ 17.954346] dvb_ca_en50221: dvb_ca adapter 2: DVB CAM detected and initialised successfully
[ 26.452284] dvb_ca_en50221: dvb_ca adapter 2: DVB CAM detected and initialised successfully
2020-05-13 16:45:41.251 ddci: CAM ci2 assigned to 0x55dd8fd7ca30
2020-05-13 16:45:41.251 subscription: 0124: "HTTP" subscribing on channel "DMAX HD", weight: 100, adapter: "CXD2854ER - DVB-C #0", network: "DVB-C DS", mux: "578MHz", provider: "Digital Free", service: "DMAX HD", profile="pass", hostname="192.168.1.9", username="admin", client="VLC/3.0.8 LibVLC/3.0.8"
2020-05-13 16:45:42.816 mpegts: 482MHz in DVB-C DS scan complete
2020-05-13 16:45:42.816 subscription: 0121: "scan" unsubscribing
2020-05-13 16:45:43.240 mpegts: 578MHz in DVB-C DS scan complete
2020-05-13 16:45:46.202 TS: DVB-C DS/578MHz/DMAX HD: H264
#1661 Continuity counter error (total 1)
2020-05-13 16:45:46.202 TS: DVB-C DS/578MHz/DMAX HD: AC3
#1662 Continuity counter error (total 1)
2020-05-13 16:45:46.202 TS: DVB-C DS/578MHz/DMAX HD: TELETEXT @ #1664 Continuity counter error (total 1)
2020-05-13 16:45:46.627 en50221: dvbca0-0: ops enquiry: {"blind":true,"explen":4}
2020-05-13 16:45:53.172 mpegts: 546MHz in DVB-C DS - tuning on CXD2854ER - DVB-C #1
2020-05-13 16:45:53.172 subscription: 0125: "scan" subscribing to mux "546MHz", weight: 2, adapter: "CXD2854ER - DVB-C #1", network: "DVB-C DS", service: "Raw PID Subscription"