...
GitLab administrator will create accounts , on your behalf, grant access for all verified people outside the GÉANT project. After that Next new collaborator will get an e-mail from COmanage Registry system with link to setup password and invitation to SWDS group. After accepting invitation the user will be able to log in to GitLab using local their account with Standard login option.
Federated Authentication (SSO) with their Identity Provider (see Pt. 1)