Vault is in offline mode, can't bring it back online

I have a few vaults and only 1 is not online:

When I press Bring Online - it returns an error: Logon failure: unknown username or bad password.

I cant see which user name is logged in

But all other vaults are working

This is the error message: 

CoSnapIn.cpp, 729, Logon failure: unknown user name or bad password. (0x8007052E)

CoSnapIn.cpp, 973, Logon failure: unknown user name or bad password. (0x8007052E)

Item_DocumentVault.cpp, 2571, Logon failure: unknown user name or bad password. (0x8007052E)

Item_DocumentVault.cpp, 2754, Logon failure: unknown user name or bad password. (0x8007052E)

RPCMethodCallWithRetry.h, 177, Logon failure: unknown user name or bad password. (0x8007052E)

RPCMethodCallWithRetry.h, 177, Logon failure: unknown user name or bad password. (0x8007052E)

RPCVaultsAdmin.cpp, 1602, Logon failure: unknown user name or bad password. (0x8007052E)

RPCVaultsAdmin.cpp, 334, Logon failure: unknown user name or bad password. (0x8007052E)

VaultManager.cpp, 764, Logon failure: unknown user name or bad password. (0x8007052E)

Vault.cpp, 3596, Logon failure: unknown user name or bad password. (0x8007052E)

Vault.cpp, 1399, Logon failure: unknown user name or bad password. (0x8007052E)

MSSQLServerServices.cpp, 2453, Logon failure: unknown user name or bad password. (0x8007052E)

DBSession.cpp, 391, Logon failure: unknown user name or bad password. (0x8007052E)

MF_Impersonation.cpp, 453, Logon failure: unknown user name or bad password. (0x8007052E)

MF_Impersonation.cpp, 517, Logon failure: unknown user name or bad password. (0x8007052E)

(M-Files 19.11.8489.2)

How Can I bring the vault back online?

Thanks in advance!