I suddenly cannot use my PASMO. I think it might be connected to a recent update on the iPhone…?

There are a few things to try:

1) Restart iPhone, make sure your Apple ID is signed in and Express Mode is on

2) If PASMO is still not working, remove PASMO from Wallet, then re-add via the Previous Cards

3) If you are using a Commuter PASMO, make sure you are not past the expiration date and that the 'Don't use SF after commuter pass expiration' option is not turned on in PASMO App.

I think it might be connected to a recent update on the iPhone…

Not sure, but check here ⤵️

Add a Suica or PASMO card to Apple Wallet

Add a Suica or PASMO card to Apple Wallet - Apple Support

Use PASMO with Apple Pay

https://www.pasmo.co.jp/mp/app/en/