You did the security code 20103 before going into long coding ?. Without it you wouldn't be able to save the code.
Related or not I see that the Obdeleven A5 module also has another byte set in mine which doesn't appear in anyone's documentation of this mod. Byte 1, hex 3 checked, see attached.
It could be until you have everything set up it does moan about things missing as the modules won't be talking to each other ?. I've not done the mod since mine was factory fitted but can be done on cars fitted with lane assist.
Traffic Sign Recognition Activation*
Select Control unit 5F (Information Control Unit)
http://i.viglink.com/?key=936384320...</span><span>Control </span><span>Unit</span>
Adaptation
Name: Car_Function_List_BAP_Gen2
Access Control: traffic_sign_recognition_0x21
Value = activated
Name: Car_Function_Adaptions_Gen2
Access Control: menu_display_road_sign_identification
Value = activated
Select Control unit A5 (front / advance camera)
Security access > Access Code: 20103
Long Coding
Byte 16
Bit 04 Activate
Select Control unit 17 (Dashboard)
Long Coding
Byte 5
Bit 02 Activate
* Traffic Sign Recognition requires having the camera on the windshield for lane assist or dynamic light assist
The Seat Club Spain
Ateca instructions I annotated with screen above have it in a different order... you could try that order if it moans less.
Mystery A5 screen on mine attached. Have a look at that as well and perhaps add to yours if still no joy.