Linphone SIP Account Authentication Fails: Continuously Prompted to Verify Password and Unable to Make Calls

I am trying to set up Linphone as a softphone using an SIP account I created online. While I was able to add the SIP account successfully, I am facing two main issues: Authentication Issue : Linphone continuously prompts me to verify my password with a dialog titled, Unable to authenticate your account. Please verify your password. Call Issue : When I attempt to make a test call by pressing the call icon next to a username, nothing happens. Here are the details of my setup and what I've tried so far: SIP Account Details SIP Provider : Linphone (where my SIP account was created) SIP Domain/Serv

Question by BrigantiumXIX on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.