Applying For VAT Exemtion After Deregistering from VAT

I recently deregistered from VAT and removed my VAT number from Amazon. Now, I have to upload invoices manually. I was told to rejoin the Automated Invoicing Program so my invoices get uploaded automatically, but I must first apply for VAT Exemption with Amazon.

Has anyone gone through this process before? If so, could you guide me on how to apply for VAT Exemption? Any tips or steps would be greatly appreciated!

Thanks in advance!