New account 4 days old, still deactivated but subscription fees applied?

Hi, total noob here in the UK trying to get into FBA. Set up account, registered bank account and credit card, uploaded passport, electricity bill and bank statement and going round in circles trying to get account ‘activated’ as they kept saying the uploaded docs were not accepted but no reason why. All are very clear, full docs and valid dates, etc. After a few days of re-uploading the docs several times they have now asked for video call to complete verification and to have the same docs available for the call – so I’ll see how that goes!

However yesterday (day 3 of trying to get my account activated) I noticed on Seller Central Payments it shows a statement with :

Paid to Amazon – Seller repayment £0.19

Then further down: Selling Fees – Subscription fee -£0.19 (in red).

I also received an email saying:

We have charged your (MasterCard) credit card for 0.19 in an attempt to settle your account balance.

Ok it’s only 19p so no biggy, but what is this? Is there some sort of subscription I’m signed up to and don’t know about? I can’t find anywhere in my dashboard that details what this is. I checked all the FBA eye watering fees and didn’t notice any subscription fee – have I missed something?