I can’t create access token under group or in project under group.
Group Access Tokens
Group access token creation is disabled in this group.
This group has no active access tokens.
If you’re using gitlab.com
SaaS, Group Access tokens are only available for groups with a Premium or Ultimate subscription.
On self-managed instances, Group Access tokens are available to all (including GitLab CE and GitLab EE Free Tier) unless they’ve been specifically disabled.
Refer to this documentation for more information: