Twinmotion sign-in error when attempting sign-in inside app

Reported in SF [Link Removed]

Attempting to sign into Twinmotion from within the TM 2026.1 editor results in a consistent sign-in error using the sign-in buttons.

Initial sign-in during launch when logged into the Epic Games Launcher works correctly and this only affects sign-in after launch.

Only TM 2026.1 is affected. Previous versions do not have this issue.

1. Launch Twinmotion 2026.1
2. If you are signed in already, sign out from the File menu or by clicking the account button on the top right of the screen
3. Attempt to sign in using the account button or from the File menu

Result: An immediate error occurs when attempting to sign into Epic Online Services

Launch Twinmotion while signed into your account through the Epic Games Launcher. You should already be signed in when Twinmotion is launched.