In Account Center, a client's account that appears under several profiles won't open or shows an error. What should I do?

When the same ad account appears under several connected profiles, Account Center shows an error that explains the problem (for example, one profile's token lost access). It also tries the profile mapped to that account first, instead of failing without explanation.

To fix it, check which profile has access to the account in your Meta business, then reconnect the one that dropped (or select the right profile in Account Center).