Hi,
Please refer to notice 741a regarding the place of supply of services:
Place of supply of services (VAT Notice 741A) Section 6 provides guidance on the general rules.
he B2B general rule for supplies of services is that the supply is made where the customer belongs.
Section 6.4 lists exceptions to the general rule that you need to review to see if any apply to your situation.
In particular check section 13 regarding use and enjoyment rules as this can move the place of supply from where the customer is located and discuss with your supplier which guidance they have referred to in making their decision:
Use and enjoyment
Thankyou.