Hi jamesmks776,
If the company was a UK established business up until 2023 then your business would have had the responsibility of accounting for the VAT over to HMRC.
Amazon are only responsible for account for VAT where your business is a NETP and so it is important to determine if and when your company ceased to be a UK established business.
Please see the rules which determine whether a business is a UK established or a NETP:
Who should register for VAT (VAT Notice 700/1) 9. Non-established taxable persons — basic information
If the UK director moving overseas has changed your business from a UK established business to a NETP then the marketplace would have become liable for VAT at this point.
If your business continued to account for the VAT incorrectly then you should complete an error correction to HMRC and pass these monies over to the marketplace so that they can pass it on to HMRC.
Please see:
How to correct VAT errors and make adjustments or claims (VAT Notice 700/45) 4. Correcting VAT errors on a return already submitted
If the appointment of a UK director in April 2024 has changed the status from a NETP back to a UK established business then again your business would be responsible for account for the VAT.
Please see the link as above for the definition of a NETP/UK established business.
Thank you.