The UK left the EU to all intents and purposes on 1 January 2021.
Businesses providing digital services to Britain from outside Britain are obliged to register for British VAT from that date and their invoices should show a British VAT number: "If you’re selling digital services from the EU to the UK you will need to register and account for VAT." from paragraph 2.5 on https://www.gov.uk/government/publications/accounting-for-vat-on-goods-moving-between-great-britain-and-northern-ireland-from-1-january-2021/accounting-for-vat-on-services-between-the-uk-and-eu-member-states-from-1-january-2021
A search shows that Irish VAT is not applicable to supplies such as these outside the EU, because the place of supply is considered to be where the service is used (not supplied). British VAT is probably applicable, in which cases a British VAT number should be quoted on Dropbox invoices.
Dropbox should supply a VAT invoice with a British VAT number on it. The Irish VAT invoice is incorrect. This would mean that the VAT is payable to the British government (and reclaimable if the customer is VAT registered in Britain).
Please can anyone explain why Dropbox invoices charge Irish VAT?
Many thanks.