Auto Action to redirect after login when meeting certain conditions

I have made an auto action to send users who meet a certain condition (terms not yet accepted) to the tab of his profile where [acceptedterms] is located.
This is what i did:
trigger: onLoginAuthentication
type: redirect
user: automatic
access: everybody
condition: [acceptedterms] does not contain 1
parameters: none

After the login attempt the reroute takes place but this happens without completing the login, so a message appears that user has to login. I enabled debug mode to see if any error occurs but no.

What can I do about it

You're interrupting the login process as onLoginAuthentication happens during the authentication of their login credentials. Set User to Self and use the onAfterUserLoginSuccess trigger to perform actions at the absolute end of a frontend login process.

Thanks Kyle,
The onAfterUserLoginSuccess trigger with the user set to self does not fire. I tested it with a redirect and the condition user_id contains 980 (the user_id of de user that logs in).

I tested it with a redirect and the condition user_id contains 980

Your substitution is missing brackets causing a string comparison to 980 which is always false. Example as follows.

[user_id] Equal To 980