[Question] Login failed. This account lacks the required entitlements.
— MMORPGs Fans (@mmorpgsfans) October 25, 2018
A lot of these users are facing an issue with their account logins. So, if you’re having a similar issue of a failed login for Fallout 76 beta the problem is not limited to you. As it stands, the beta version is time limited and you might have to wait for it to start again to gain access.
By “the required entitlements” all the developers mean is that it is only a matter of time. Once the second period of Fallout 76 beta version gets announced no user will have an issue of a failed login. That is only if you manage to join within the time limit.