Can't login into my server from newly installed Element

[Manifoldme]

Steps to reproduce

Issue: I enter my server address and the app returns ".well-known not available".
Element 1.6.18
Samsung S21 Ultra,
Android 14,
One UI 6.1,
Security Patch August.

I've been self-hosting Synapse for about six years without federation/delegation, so .well-known is not present in my installation.
First I had a problem with the microphone on 1.6.20, where after a screen went off, my microphone also went off.
So I tried Schieldi, but it never worked for me in the past and the notification issue is still there, so I installed the older version of Element from F-Droid 1.6.18, but suddenly
I experience the same problem I had with ElementX which works over proxy, and that's why I don't use it.
Update.
Synapse 1.114.0+Bookworm1
has integrated sliding sync, that's might be the culprit.

Outcome

What did you expect?

What happened instead?

.well-known not available

Your phone model

Samsung S21 Ultra

Operating system version

Android 14

Application version and app store

1.6.18

Homeserver

Synapse 1.114.0+Bookworm1

Will you send logs?

No

Are you willing to provide a PR?

Yes

[Alex11381]

I have same problem. How you fix it?

[JitteryDoodle]

Can confirm that I'm also having this issue on versions 1.6.14-1.6.18 on GrapheneOS (Android 14, Build 2024090400).

Installing the older versions did not fix this issue.

However, this might be related to a change on the actual synapse client maybe? When I run curl to get the same file:

curl https://matrix.mydomain.xyz/.well-known/matrix/client
{"errcode":"M_NOT_FOUND","error":".well-known not available"}% 

So this file really doesn't seem to exist on my Synapse endpoint, which is probably the issue.

[JitteryDoodle]

Solved! I had to add the .well-known information to my reverse proxy.

Follow this guide and set up the files manually, then you can sign in via Element.

[Ninjustin649]

I also had this issue. I resolved it by setting "public_baseurl: https://matrix.domain.name/" in homeserver.yaml. After restarting the matrix synapse service it started hosting the .well-known file.