ASIN changed to 'inactive' and requires approval.

I've have an ASIN, that has been selling without issue for years, had its status changed to 'inactive'.

When trying to resolve, I get a message that I require approval to listing ASIN. I am the brand owner, and have been ungated in the Health and beauty catagory for years. All other ASINs are active, it is just one that has this issue.

Seller Support are, unsprisingly, unhelpful at explaining why, or how to get the ASIN active.

Has anyone else experienced this/ have any suggestions as to how to resolve?