Emby Web login sends Username instead of UserName, causing HTTP 400 - Emby server version 4.9.5.0

[pavlidis 2]

Hi Emby community, I think there is a login bug in Emby server 4.9.5.0. The web login fails for me across multiple devices and browsers, and the server log shows Value cannot be null. (Parameter 'name') on POST /emby/Users/authenticatebyname.

After checking the network request, I found that Emby Web sends the form body as Username=myuser&Pw=mypassword, but the server seems to expect UserName=myuser&Pw=mypassword with a capital N. I tested this manually: Username=test&Pw=test returns HTTP 400 with the null name error, while UserName=test&Pw=test reaches normal login handling. As a temporary local fix, I changed the bundled web client from Username:name to UserName:name, and login started working again.

Could you please check this casing mismatch?