eBay have blocked from selling saying I need a VAT number

[dig.jr]

I have been blocked from selling on eBay as they say I need a VAT number. However, I don't sell much at all, a few private listings, so they say I need to get a tax emeptiom certificate from HMRC. I can not find any information on how to apply for this online. Can anyone direct me to the proper place to apply for such a thing please? Thank you.

[fargvs]

Random computer generated messages indicating an unrelated problem ?... Your selling account has been unused for more than a year and may be blocked for security reasons ... if so, you will need to contact Customer Services.

Some settings may also be out of date ... A complete recheck and update may help including resetting Automatic Payment/Reimbursement methods >
https://www.ebay.co.uk/help/buying/paying-items/paying-paypal?id=4033
https://www.ebay.co.uk/help/account/changing-account-settings/changing-account-settings?id=4193