3620423 - Error when access an event: "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 access at a sourcing event:

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, access event, multiple accounts, correct permission , KBA , BNS-ARI-SS-EVT , Sourcing Events , BNS-ARI-SS-EVT-LGN , Sourcing Event Registration/Login , BNS-ARI-SS-ADU , User Administration , Problem