Hello there @ToniAmaral!
Checking through your log, I believe the most relevant calls are the following:
ErrorCode=[errors.com.epicgames.account.auth_token.invalid_refresh_token]
ErrorMessage=[Sorry the refresh token … is invalid. Reason: TOKEN_NOT_FOUND]
…
ErrorCode=[errors.com.epicgames.account.oauth.authorization_pending]
ErrorMessage=[The authorization server request is still pending as the end user has yet to visit and enter the verification code.]LogHttp: Warning: HTTP request timed out after 300.00 seconds URL=https://mh-uemhc-autorig-service.eeeb.live.use1a.on.epicgames.com/v1/autorigs/c1490378-f119-49bc-bbf1-290fa8b6a349?waitSeconds=10
LogMetaHumanCharacterEditor: Error: Auto-Rigging of Face failed with code ‘Server Error’
These errors aim at networking/connection issues, either your Epic login session failing to refresh. or the authentication process getting stuck. So the first step would be to check your internet connection during rig creation. If you are working behind a VPN, or using heavy security, test by termporary disabling these features for the process.
If the issue persists, the next step would be to verify/repair your UE installation, then clearing the engine’s cache via deletion of folders Saved, intermediate, and Derived Data Cache. Finally, test metahuman in a new, empty project, with no extra plugins or assets loaded.