It has raised fears that passengers may face delays
Anyone trying to access their COVID Pass is currently receiving an error message saying that high traffic volume is “limiting access to the service”.
In a tweet, NHS Digital Confirmed that there was a problem with the app.
One post said: “There are currently issues with accessing COVID passes on the NHS app and website.
“We are investigating this issue and will update as soon as possible.”
This feature, which tells how many doses of the vaccine a person has received, is needed by people wishing to travel abroad.
This has raised concerns that those wishing to travel may face delays or be turned away.
Several social media users responded to the NHS asking whether or not to travel – although it is unclear how this has affected those waiting to fly.
One Twitter user wrote: “Any guesses how long this will take to fix?
“Due to travel in 4 hours’ time, but not if the app is not working again.”
The other replied: “Not good. Morning flight. Need a pass stressful. “
Chuck Adolfi, 24, told the Guardian he missed his flight from Gatwick airport to Slovenia on Wednesday afternoon because he was unable to load his vaccination pass. He told the newspaper that the situation was an “uncomfortable one” and claimed that about 20 other people had been taken out of the airport with him.
The app is also important for those traveling to countries where vaccine certification is required for admission to restaurants, bars or museums.
One Twitter user complained that they “can’t do anything in Naples” because they were unable to prove they were double-jabbed. Italy is one of European countries to demand proof of vaccination before entering indoor venues, including restaurants, cinemas and theatres.
The NHS app is available for use as a vaccination certificate for anyone over the age of 16 who has been double-pocketed in England, Wales or the Isle of Man.
Users can download a PDF copy of their pass directly from the app and save it to their device, and iPhone and iPad users are able to download the pass to their e-wallet.