Debian Client Registration Issue with architecture 'amd64' not being supported or recognized

Problem:
I’ve managed to setup a Debian repo and I’m trying to get a client registered. I can run:

subscription-manager register --org="My Company" --activationkey="Operations Non Prod Debian"

I get this:

root@debian1101:/tmp# apt-get update
Hit:1 http://security.debian.org/debian-security bullseye-security InRelease
Hit:2 http://deb.debian.org/debian bullseye InRelease
Hit:3 http://deb.debian.org/debian bullseye-updates InRelease
Ign:4 katello://foreman.local/pulp/deb/My_Company/Non_Production/Debian_11_Content_View/custom/Debian_11/Debian_11_1_Bullseye default InRelease
Ign:5 katello://foreman.local/pulp/deb/My_Company/Non_Production/Debian_11_Content_View/custom/Debian_11/Debian_11_subscription-manager default InRelease
Hit:6 https://apt.atix.de/Debian11 stable InRelease
Get:7 katello://foreman.local/pulp/deb/My_Company/Non_Production/Debian_11_Content_View/custom/Debian_11/Debian_11_1_Bullseye default Release [904 B]
Get:8 katello://foreman.local/pulp/deb/My_Company/Non_Production/Debian_11_Content_View/custom/Debian_11/Debian_11_subscription-manager default Release [1,664 B]
Ign:9 katello://foreman.local/pulp/deb/My_Company/Non_Production/Debian_11_Content_View/custom/Debian_11/Debian_11_1_Bullseye default Release.gpg
Ign:10 katello://foreman.local/pulp/deb/My_Company/Non_Production/Debian_11_Content_View/custom/Debian_11/Debian_11_subscription-manager default Release.gpg
Reading package lists... Done
N: Skipping acquire of configured file 'all/binary-amd64/Packages' as repository 'katello://foreman.local/pulp/deb/My_Company/Non_Production/Debian_11_Content_View/custom/Debian_11/Debian_11_1_Bullseye default InRelease' doesn't support architecture 'amd64'

I can confirm this is the current architecture on the client:

root@debian1101:/tmp# dpkg --print-architecture
amd64

And this is how the repository is configured:
image

How to get it to register properly and recognise the repository correctly?

The configured architecture appears to be correct so I’m not sure why it’s generating this:

N: Skipping acquire of configured file 'all/binary-amd64/Packages' as repository 'katello://foreman.local/pulp/deb/My_Company/Non_Production/Debian_11_Content_View/custom/Debian_11/Debian_11_1_Bullseye default InRelease' doesn't support architecture 'amd64'

Expected outcome:
Client correctly registered with Foreman / Katello and able to pull down packages without issues.

Foreman and Proxy versions:
Centos 7.9
Foreman 3.0
Katello 4.2
Foreman and Proxy plugin versions:

Distribution and version:

Other relevant data:

For reference - contents of:

https://foreman.local/pulp/content/My_Company/Library/custom/Debian_11/Debian_11_1_Bullseye/dists/bullseye/Release

Origin: Pulp 3
Label: Debian_11_1_Bullseye-71457
Suite: stable
Version: 1
Codename: bullseye
Date: Fri, 22 Oct 2021 14:19:58 +0000
Architectures: all amd64
Components: main
SHA1:
 2e0353800ae9db007e2fb4887194a52fec3d45c9         20493366 main/binary-all/Packages
 57344e6088cd86a006661bd9b41583b60b8b0fc7          6363554 main/binary-all/Packages.gz
 fea6adc682b5fae20bbc5e3c8d4f861db5710792         25110577 main/binary-amd64/Packages
 3705c5d5f0b7d162edff3e70d1af2f78cd9b1da6          7634265 main/binary-amd64/Packages.gz
SHA256:
 b02183b3d97a62e082bd74309b469f07133c35b6668fb3032646af0470e8dd37         20493366 main/binary-all/Packages
 cc3214cba9945a64f734d79677edf0c0c8edf3f9a62305e8a13375ba9fba731c          6363554 main/binary-all/Packages.gz
 47652f87f03dcf0da74c5e9f4042e2a38a45be647e59838daa1ad8941aa56ca0         25110577 main/binary-amd64/Packages
 634f0fdec1cdaa3fd30128510e2ac592551b62466802e4ec3594ad4518970c21          7634265 main/binary-amd64/Packages.gz
SHA512:
 ed2c67880e6367f7d2ef41246687368eea0bb3f7071d859f3fc7b7453e37b630a5ec3216d4d0ee2c14b536b4ede50320ff38c3c8a25de0b8ad2477166461f7df         20493366 main/binary-all/Packages
 3f5288ebe30133ee62b1123843019349417a5d33a95fe166a15a7c169a54bf4ffefcc0ac04ca2d33b8ea88568b44b31bada771642aed96fe21e3d282da0269ae          6363554 main/binary-all/Packages.gz
 efa1c8a6bf1640d4f77e714b795d43314b6b3f82ee2428f34e81d6ec9bfa686b17c033678263e43557cb0cb6703defce474d79d143971bdacde75b000c7a0858         25110577 main/binary-amd64/Packages
 d4befe63098aba0c413bd5dbba6bdd258ffbe848f92bed4baf01834b2cc676a8d3426eae0c5172dec6ead35da10f15d32402eda3995739dc674bf14df0c0f3b2          7634265 main/binary-amd64/Packages.gz