Password reset did the job. Thanks

Hmm. It doesn't seem to work on iOS 15.7.7 with SE first gen. After adding app to desktop it behaves just as standard browser window with address bar visible constantly on the screen etc. Other app that uses PWA works well ex. miniflux, snappymail. I know that push notifications won't work below iOS 16 however there are some tweaks with changing safari variables but doesn't work either.