DNS Help required

Hi there, I have an Instance of WP hosted with AWS. Have been trying to tweak the DNS settings all week and expended all possibilities within my knowledge bank. the site is at beta.brokenabacus.co.uk (brokenabacus.com should redrirect)

I’ve hit a stumbling block with my DNS settings here: https://www.whatsmydns.net/#CNAME/cdn.brokenabacus.com
and have no idea how to resolve the ‘Token mismatch’ error

I’m using MaxCDN with WP CDN Rewrite plugin. Support from various channels is conflicted and I just need someone experienced to point out my errors.

Hopefully someone can give some Samaritan type help to a low level developer

best wishes
Chris