Describe the bug
When signing in either through Microsoft or GitHub with Live Share, the connection process does not go through.
From Microsoft: AADSTS50011: The reply URL specified in the request does not match the reply URLs configured for the application: 'a3037261-2c94-4a2e-b53f-090f6cdd712a'.
From GitHub: Unsupported redirection domain.
Please confirm that this problem is VSCodium-specific
Please confirm that the issue/resolution isn't already documented
To Reproduce
Steps to reproduce the behavior:
Expected behavior
I expected to sign in and use Live Share.
Screenshots

Desktop (please complete the following information):
Additional context
N/A
Temporary workaround:
Copy the link from VSCodium login, replace vscodium: with vscode:
If you still have a redirect error, copy the user code from the address bar and use it with the sign in with user code option (via Alt+P) on vscodium
@lodi-g I think @forward2k 's temporary workaround is as good as we can get here -- since the extension/website assumes a "vscode:" protocol, manual intervention is needed to tell it about VSCodium. Will close this out for now.
Hi this doesn't seem to work for me, nor am I unable to find the option where I can put in the user code. Is it possible to elaborate?
So just to elaborate on my part, when I change to vscodium: with vscode:, it asks for xdg-open to launch VSCodium, which I allow, but then allows as OP mentioned, it stays on Signing In.... For some reason it doesn't seem to receive the call from the browser.
So to add more, I'm able to get VSCodium to bring up below screen, but still nothing.

So just to elaborate on my part, when I change to
vscodium:withvscode:, it asks forxdg-opento launch VSCodium, which I allow, but then allows as OP mentioned, it stays onSigning In.... For some reason it doesn't seem to receive the call from the browser.
same here on Mac OS X 10.13

@stripedpajamas could we please reopen this and possibly find a solution?
Try logging in with your user code
Step 1: Go to this URL
Step 2: Login with microsoft account and copy the code.
Step 3: Open command palette in VSCodium and type _user code_. In the popup box, just enter the code.
This sould work in most cases
One additional step to the comment from @Vrishtrix.
To copy the code: click first on "Having trouble? Click here for user code directions",
(I was actually copying it from the url 馃う )
The whole instructions are in: https://docs.microsoft.com/en-us/visualstudio/liveshare/use/vscode#sign-in-using-a-user-code
reference-link for a somedayTM own remote option: #266
Anyone got a clue about github login? All the comments here assume microsoft login from what I can tell.
Alright, workaround provided in https://github.com/MicrosoftDocs/live-share/issues/3218 works:
Live Share: Sign In With User CodeThat workaround is listed here already: https://github.com/VSCodium/vscodium/issues/320#issuecomment-639345453 :-)
Most helpful comment
Try logging in with your user code
Step 1: Go to this URL
Step 2: Login with microsoft account and copy the code.
Step 3: Open command palette in VSCodium and type _user code_. In the popup box, just enter the code.
This sould work in most cases