"...Using the EFP requires a valid project on an integrated EuroHPC system...."
when trying to accept the invitation to my allocation.
A: Please note, that only the person receiving the invitation (principal investigator, PI) can accept it. The link can not be forwarded e.g. to the member of your project. After the PI has accepted the invitation, they can invite project members to the project (see: https://docs.my-eurohpc.eu/allocations).