To expand a little bit my question, as it is related.
Here VAT Updates - January 2021 - #27 by ian_roberts
@ian_roberts explains that
Supplies of services where the “place of supply” is not the UK are technically considered “outside the scope of UK VAT”, but you’re still supposed to include the net value in box 6 on your VAT return. @Glenn can confirm for definite but I believe that ticking the “out of scope” box in QuickFile will exclude the invoice from box 6, therefore the correct course of action in this case would be just to treat it as zero rated by selecting “no VAT”.
Then I should not mark it as out of scope so it appears on the box 6?
Probably getting a little confused on this now and may need to read this again tomorrow.