@girish Got it. So as long as I stick with the Cloudron LDAP, all is well. Thanks for the explanation, and also for the update to the docs.
@girish Only Bookstack. Yourls installed just fine.
I have updated bookstack package to support optional cloudron authentication. If you do a fresh install, you will get the option to install without cloudron auth. After that, you can enable external registration.
@subven thank you I will give it a try.