Enrolment to Managed Payment is by invitation only, not "self registering."
Your link to the article is invalid.
In the future, please post your links with user safety in mind.
Code:
https://www.ebay.co.uk/sellerhelp/payments
Link works for me.
I've just logged in with one of my sleeper accounts with no sales and it does indeed say what OP wrote:
"Managed payments provides sellers one place to sell and get paid, and buyers more ways to pay.
eBay will require all marketplace sellers in the United Kingdom to register for managed payments in 2021. Get ready and complete registration now."
followed by Register Now Button
"Once you complete registration, your account is immediately activated for managed payments. Your listings will show additional payment methods, and payouts will be sent to your bank account."
You can't self-register, you can only express interest. I want to register my account for MP asap but all i can do is express interest and i don't receive any email or message from ebay notifying me about anything.
The link you posted just redirects to https://www.ebay.co.uk/help/home which is a support page.
Last edited by vmdetection; 02-21-2021 at 05:29 PM.
UK managed payment is mandatory in 2021!! 
