i cant buy free xbox 360 game or get my games with gold

I have the same issue because I don't have a payment method associated with my account other than prepaid cards. The work around that I found to work is by going onto my 360 console to do the transaction. After I get the Games with Gold game on the 360,
it then becomes available to download on my One. If you don't have a 360, I guess try and choose a different payment method other than pay pal.

That error code you're getting in the pic above: 80150017 is related to a region issue. The 360 may still see you as being set in the US and not the UK. Try going to http://live.xbox.com/accountmigration
and migrating your account region to the UK.

Support is still available through the contact site. They have not shut down for covid.

thank you i will try this

Paypal is considered a valid payment option for 360 content so that should not cause the issue. You may have to contact support and speak to billing to see if they can see why it would be blocking the use of that for 360 content. http://support.xbox.com/contact-us

Had you previously used a 360 before getting a One? The only other issue I could see might be a region thing. There have been issues where people who had not previously used a 360 or had used a 360 but changed regions after using a One would get errors because
the 360 system would see them as being in a different region.

my account is not a child account as i can play 18+ games i whent into my setting to check and its on custom but if i change this it still have no effect on my ablity to get 360 games

If you have an old Xbox 360. You can download it to that system, then upload to your Xbox 1 that may help .