I reported this error to the BoomerangMe Help Desk two months ago. Unfortunately, I haven't heard anything from them yet. This is a bit ridiculous because my client cares about notifications working properly and he gave me a terrible telling-off. I don't blame him because two months have passed and the bug is still not fixed. On top of that, as an agency, I can't even say anything about what's going on with this issue because I don't have any information from the BoomerangMe team.

I found the cause of the error myself. I presented it to the BoomerangMe team, and so far, nothing...

What's going on... Let me explain:

If your client has created, for example, two or more loyalty cards for their company and offers them to their customers, and there are people who have installed both cards on their phone, then if someone on one of the cards disables and re-enables push notifications from the card level on the reverse side of the card, push notifications for the other card will automatically stop appearing on the phone screen.

The problem occurs with PWA installations. I have tested this on different brands of smartphones and the problem is the same everywhere.

Please test this and vote for this issue to finally be fixed.