Teletext Decoding on ADV7280A

I want to decode teletext inserted on an ADV7280A analog output and insert onto parallel video ancillary data. The decoder shows teletext in status registers, but does not insert it into ancillary data. I am using this eval board: EVAL-ADV7280A Evaluation Board | Analog Devices Does the ADV7280A require implementing the network layer for teletext ancillary data insertion? The expected output is an ancillary data flag (ADF) and a counting pattern with my current implementation.

I am inserting teletext as shown below with an ADV7393 driving the link. Following ITU-R BT.653, I transmit 360 bits total with the first 2 bytes of clock run in as x"AA", x"AA" followed by a frame sync byte of x"E4".

Attached below is the register settings for the ADV7280A. I have written to it enabling teletext decoding, ancillary data insertion, and using PAL video with Teletext WST Type B.

delay 10 ; Wait 10ms After Hardware Reset To Start I2C
42 0F 80 ; Reset ADV7280A
56 17 02 ; Reset Encoder
delay 10 ; Wait 10ms 
42 0F 00 ; Exit Power Down Mode [ADV7280A writes begin]
42 52 CD ; AFE IBIAS
42 00 00 ; CVBS in on AIN1
42 0E 80 ; ADI Required Write 
42 9C 00 ; Reset Current Clamp Circuitry [step1] 
42 9C FF ; Reset Current Clamp Circuitry [step2] 
42 0E 00 ; Enter User Sub Map
42 80 51 ; ADI Required Write
42 81 51 ; ADI Required Write
42 82 68 ; ADI Required Write
42 17 41 ; Enable SH1
42 03 0C ; Enable Pixel & Sync output drivers
42 04 07 ; Power-up INTRQ, HS & VS pads
42 13 00 ; Enable ADV7280A for 28_63636MHz crystal
42 1D 40 ; Enable LLC output driver [ADV7280A writes finished]
56 00 1C ; Power up DACs and PLL [Encoder writes begin]
56 01 00 ; Set Encoder to SD mode
56 80 10 ; SSAF Luma filter enabled, NTSC mode
56 82 C9 ; Step control on, pixel data valid, ped on, PbPr SSAF on, YPbPr out
56 87 20 ; PAL/NTSC autodetect mode enabled
56 88 00 ; 8 bit input enabled [Encoder Writes finished]
42 0E 01 ; Access interrupt/VDP subreg space
delay 10 ;
42 60 05 ; PAL Teletext (WST) B, enable user programming of teletext type
42 62 B5 ; Enable ancillary insertion, byte mode no restrictions, ADF_DID[4:0]=10101
42 63 2A ; disable duplication, SDID=[5:0] 
End

Any tips on debugging this?