I doubt that’s the issue. You need to contact them to find out what the issue is

I started using SimpleLogin just before the acquisition so wasn’t aware of how active development was prior to Proton. That said I don’t believe they have added anything new in that time (a year now)?

Version 4.0.7
ch.protonmail.android

The beta mail app also finally added support for adaptive icons on Android

I’ve not heard of these before. Do you use them yourself?

Man. I tried Skiff last year and was impressed. The only thing I didn’t like was there was no easy export option for my mail. I ended up on Proton. Skiff was looking promising. Kinda glad I dodged that bullet now.

I get the feeling they are trying to create a suite of applications to keep you locked into the ecosystem.