Adobe Portfilio site not being indexed - chatgpt receives 403 Forbidden

As much as I dislike AI stuff, it’s being used a lot as a search engine now - I’ve been struggling to get my Adobe Portfolio page to come up in results on ChatGPT while it can find the site and read the home page, it can’t access a sub-page and when drilling down apparently it’s receiving a “403 Forbidden” response. 

My site is: https://castlelanestudios.co.uk/
It receives a 403 accessing: https://castlelanestudios.co.uk/gallery-quality-printing

This means that people aren’t being recommended my services when when searching specifically for fine art giclée printing.