From the sandboxed Play Store I installed the Dutch Government identity app DigiD on my Pixel 6a. Dutch government websites use this ID method as a login, of course. But also, for example, my insurance company uses DigiD as a login method. However, using the government website in Vanadium browser, or using the insurance app gives problem because they cannot "see" the DigiD app. On my wife's phone, Pixel 8a, there is no problem, Vanadium and her insurance app can "see" the DigiD app and hence my wife is able to login.
Creating her profile on my Pixel 6a gives negative result: also there the DigiD app cannot be found by other apps.
So the problem is probably related to the device 6a. On both devices, the configuration of the DigiD app is the same. Of course the GrapheneOS is up-to-dated on both devices. Any suggestion?