Feature Request: Make chatbox working with Synapse Guest Accounts

[promasu]

Currently the Chatbox creates an account with random credentials when using the chatbox. Since Synapse has the feature of guest accounts ignoring the normal authorization flow (like if you need to provide a mail address) the availability of this method does not need administrators to disable mail auth etc. if wanting to use the chatbox.
Would be awesome if you can implement that

[s-kennedy]

@promasu actually I did try using the guest account feature early on in the dev process but I wasn't able to get it working so I abandoned it and went with the random credentials. I can't remember why though, so I might revisit it again.

[s-kennedy]

@promasu I decided to give the guest account feature another go and I remembered why I abandoned it before -- I can't use startClient with a guest account. This is the issue I run into: matrix-org/matrix-js-sdk#998

[promasu]

Ah ok. Thanks for the update!