@dewa_santa Please take a look at this conversation and the workaround described here: https://github.com/passbolt/mobile-passbolt-android/issues/22#issuecomment-3056109262 — I suspect you’re encountering similar JWT-related issues.
According to the logs, you were able to reach the server, so the certificate is not required on your Android device (the auth/verify.json endpoint must succeed before accessing auth/jwt/rsa.json).
Asquadia attempted to run the server on his homelab using a self-signed CA certificate, which does require installing the .pem file on the Android device.
If, for any reason, you still need to install the certificate (which is NOT recommended in your case), try placing the .pem file in the Downloads folder and initiate the CA certificate installation from Android system settings.