3186405 - Error: "You do not have the correct permission to view the event or the event link you clicked may be invalid."

Supplier receives the following error when trying to register to the site:

You do not have the correct permission to view the event or the event link you clicked may be invalid.

If you have multiple accounts, ensure you logged in to the account
associated with the document, task, or event. Click Go back... to view other events you have been invited to.

Error access event, Error, multiples accounts , KBA , BNS-ARI-SS-ADU , User Administration , BNS-ARI-SC-UM , Strategic Contracts User Management , BNS-ARI-SS-EVT-LGN , Sourcing Event Registration/Login , BNS-ARI-SS-EVT , Sourcing Events , Problem