I just installed Vaultwarden on my Home Assistant server – VW is a Home Assistant add-on that runs on top of HA. The docs say that it is actually bitwarden under a different name.
After installing it, I was able to browse to the server (using my duckdns domain and encryption certificate from LetsEncrypt) and create an account for myself.
Having done that, I installed bitwarden on my android phone and tried to connect it to the server. When I enter my email address (the one I used when I created my account), BW throws an error message that says “We were unable to process your request. Please try again or contact us.”