iOS App SSL issue

I reconfigured my self-hosted Bitwarden Instance to run via SSL only. I was able create all self-signed certificates following this Link and imported root and certificate to iOS as Profile and they are shown as “validated” certificate. Safari still seems to untrust the certificates when opening the Webtresor for whatever reason. The Bitwarden App in iOS still can´t connect due to an SSL-Error - could be related but i am not sure. I also reinstalled the App but the error remains the same. What am i doing wrong??