Hi.
Please refer to notice 741a section 6 regarding place of supply rules for services.
6. The place of supply rules for services
If you determine that the place of supply is a country outside of the UK then this would be outside the scope of UK VAT.
You may need to check with the country you are supplying to, to see if this makes you liable to register in that country.
For the UK VAT registration threshold you would need to look at supplies where the place of supply is here in the UK.
Please refer to the guidance here for what should be included when calculating your UK taxable turnover
Register for VAT
Thank you.