What is the Agendav login?

I might have a very stupid question: how do I login to AgenDAV?
Upon launch it shows me a login screen with ‘Invalid username or password’.
I have no idea what username and password to use here.
Maybe AgenDAV somehow not connected to SSO?

I’ve finally found a solution: I had set the WebDAV authentication type in Baikal to Digest, as per https://yunohost.org/#/app_baikal_en. After switching it back to LDAP-UserBind, AgenDAV started to work. I also had to switch credentials in Thunderbird and DavDroid, from Baikal’s to Yunohost’s.
Of course I also updated the documentation that mislead me.