(Note: this is specifically for an Australian GST tax invoice but it may work for other countries)
Uber advise that to obtain a tax invoice itemising the GST for the meal and delivery components of an Uber Eats purchase, you must lodge a request via their Help facility.
To do this, go to Getting Help from Uber. You will be required to sign into your account.
Submit a request for a tax invoice corresponding to your Uber Eats order number. You will subsequently receive a reply with a link to the tax invoice.
Leave a comment below if your experience differs, or if there’s a simpler way to get a tax invoice.