Tvheadend

I have looked through many fora for a solution but have been unable to get this to work.

Hardware:
Digital-Devices DVB-C/T 6.1
Digital Devices Flex CI
Alphacrypt Light 2.2 (One4All 2.4, tested, is working)
Sky V14-Smatcard

Software:
Libreelec E 8.1.1 (DVB-Driver community Build)
HTS Tvheadend 4.3-361

Provider:
DVB-C (Netcologne, Cologne, Germany)

What works:
All FTA-Channels.

What does not work:
All encrypted channels.

The CI is recognized by en50221 and TVHeadend.

Sep 25 17:36:58 LibreELEC kernel: ddbridge 0000:02:00.0: Port 0: Link 0, Link Port 0 (TAB 1): DUAL DVB-C/T
Sep 25 17:36:58 LibreELEC kernel: ddbridge 0000:02:00.0: Port 1: Link 0, Link Port 1 (TAB 2): CI
Sep 25 17:36:58 LibreELEC kernel: ddbridge 0000:02:00.0: Port 2: Link 0, Link Port 2 (TAB 3): NO MODULE

journalctl | grep en50221
Sep 25 18:47:16 LibreELEC kernel: dvb_ca_en50221: dvb_ca adapter 2: DVB CAM detected and initialised successfully
Sep 25 18:47:20 LibreELEC kernel: dvb_ca_en50221: dvb_ca adapter 2: DVB CAM detected and initialised successfully
Sep 25 18:47:24 LibreELEC tvheadend⁶⁸¹: en50221: CAM slot 0 supported CAIDs: 098C (NDS) 0648 (Irdeto) 1702 (BetaCrypt) 1722 (BetaCrypt)
Sep 25 18:47:24 LibreELEC tvheadend⁶⁸¹: en50221: CAM slot 0 supported CAIDs: 1762 (BetaCrypt) 4A20 (0x4a20) 0500 (Viaccess) 0B00 (Conax)
Sep 25 18:47:24 LibreELEC tvheadend⁶⁸¹: en50221: CAM slot 0 supported CAIDs: 0100 (Seca) 1833 (NagraVision) 1834 (NagraVision) 0D05 (CryptoWorks)
Sep 25 18:47:24 LibreELEC tvheadend⁶⁸¹: en50221: CAM slot 0 supported CAIDs: 0D95 (CryptoWorks ICE) 09C4 (NDS) 093E (NDS) 0963 (NDS)
Sep 25 18:47:24 LibreELEC tvheadend⁶⁸¹: en50221: CAM slot 0 supported CAIDs: 0919 (NDS) 09C7 (NDS)
Sep 25 18:47:25 LibreELEC tvheadend⁶⁸¹: en50221: CAM slot 0: Application type: 01, manufacturer: 4a20, Manufacturer code: 4a22
Sep 25 18:47:25 LibreELEC tvheadend⁶⁸¹: en50221: CAM slot 0: Menu string: AlphaCrypt

I have tried redirecting to it,

echo "00 01" > /sys/class/ddbridge/ddbridge0/redirect

-> ddbridge ddbridge0: redirect: 00, 01

but still it does not work.

Does anyone have a working setup like this or similar to this?

Do you know of any other forum or ressource I could look into?

Any help would be greatly appreciated!