Apple Trade in help

Hi, i was wondering if someone could help me please?

I've got a new phone and i'm now wanting to trade in an old device.

I go online to Apple Trade in and select 'Find your trade-in value' and select the following options -

Apple

iPhone 12 Pro Max

256GB

(Is your iPhone in good condition) Yes

Trade in for an Apple Gift Card

I then enter the serial number and verify it.

Then it takes me to the section 'Just a few more details' I enter my name, address, email address and phone number and agree to everything and select finish.

This is where i then have the issues. It then says -

'Use recommended address instead

We’re unable to verify your address, but found a close match. If you choose to use the address you entered, we may not be able to complete your trade-in.'

It's recommended the exact same address i have entered so i just select use recommended and it takes me to the next section.

It then asks for all my details again so i put my name, address, email address and phone number and agree to everything, however this time it doesn't allow me to select finish. The finish button is faded out.

Am i doing something wrong or is there something wrong with the trade in system?