Nextcloud Talk connection not possible

I have a useable connection with the nextcloud all under android. On my server I have also a usable nextcloud talk installation. The first access with the nextcloud talk up under Android was successful. I want to use also the password app an I got an http error 404. So I deinstalled all nextcloud app and startet the installation again. Fist one nextcloud app: successfull, Nextcloud deck: successful, Nextcloud notices: successful but the nextcloud password: Network error, Nextcloud Talk: unsuccessful. I import for access the account from nextcloud app, after some secouds the app jump back to the screen to type in the server adress from the nextcloud server.
It seems the apps Nextcloud talk and nextcloud password have many bugs.
Maybe someone has the same problems and has solution tips.
Thank you for every help I will get.