I see the error, 'Something went wrong. Please sign in again.' when attempting to sign in to the Unity Hub and Unity ID portal

Symptoms:

• I see the error 'Something went wrong. Please sign in again.'
• I can't sign in to the Unity Hub.
• I'm unable to log into the Unity Hub.

Cause:

The error, 'Something went wrong. Please sign in again.' when attempting to sign in to the Unity Hub, is generally caused by a connection issue between your machine and the Unity servers.

Resolution:

If you can sign in at id.unity.com using your browser but not through the Unity Hub, this suggests that something is blocking the connection between your machine and our servers—usually antivirus software, a firewall, or a proxy.

When signing in, the Hub needs to open a browser tab. Ensure that your browser allows Unity to open this tab. If access has previously been blocked, close the Hub process entirely, clear your cache and cookies, and try signing in again.

Users have also reported conflicts with certain browsers when attempting to sign into the Unity Hub. As such, we recommend setting a different default browser to see if this helps resolve the issue.

If you're using antivirus software, a firewall, or a proxy, the simplest solution is to add entire domains for the following resources in your exception list:

• unity.com
• unity3d.com
• plasticscm.com
• google.com
• googleapis.com
• microsoft.com
• aka.ms

If you want to selectively control the subdomains, add items from the table contained in the proxy exception manual page. 

See also: Using Unity through web proxies

More information:

If you continue to have trouble signing into the Hub after configuring your firewall & proxy, contact the Customer Experience team with your log files for further assistance. 

https://docs.unity3d.com/2023.1/Documentation/Manual/ent-proxy-exception-list.html 

https://docs.unity3d.com/2023.1/Documentation/Manual/ent-proxy-autoconfig.html