The username you need to use for the Vault apps is slightly different to your usual Vault logon - it needs to adhere to the following format:
vaultusername@companyid-##.vaultgrc.com where the bold sections are changed to reflect your individual information.
For example; firstname.lastname@example.org
Hint: you can check your Vault URL to find your company ID:
Please ensure that there are no spaces in your username - your device's autocorrect function may automatically change what you have entered.
If you're still having trouble logging in, please log a support request here.