It is working again
Update April 10, 2022: after last dictionary update it is working correctly again. Answer to developer response on April 5, 2022: Since March 28, 2022, I am trying to update the dictionary exactly as you describe by clicking on the icon in the upper right corner, on the camera screen. The message I always receive is “Your application is already updated”, and nothing changes. I also tried to uninstall it and reinstall, again, nothing changes. About internet access, I do have 24-hours internet access, at home by FTTH 10Gbps and on my iPhone by LTE with 10Gb, provided by MEO. And I want to recall that the EU vaccination certificate I have is issued in Portugal, as I live in Portugal and I am Portuguese. Since March 28, 2022, update the app does not work properly. Valid vaccination certificates with 3 doses issued in Portugal are no more validated. Thank you very much for not helping anyone!