At the moment vaccines administered overseas cannot be recorded in the UK National Immunisation Management system (NIMS) which is the system used to show your vaccination status in the NHS App. Therefore the ability to show any “overseas” Vaccination Certificate and request a Vaccination Passport is not currently available from the NHS.
This issue is being worked on at a national level and an update is expected shortly. We will update you further as soon as we know more.
Any queries regarding this issue need to be directed to NHS 119 or to NHS App support rather than the GP practice: https://www.nhs.uk/contact-us/nhs-app-contact-us/