This scenario assumes the current connection to the database is valid and that you are simply updating user credentials.
This scenario assumes there is no access to the Veeam Backup for Salesforce interface since the database connection is unavailable.
In a browser, open the Veeam Backup for Salesforce URL with the access token from above.
Example:
This form is only for KB Feedback/Suggestions, if you need help with the software open a support case