Unable to add Nutanix AHV cluster due to empty credentials list

To fix the issue, do the following:

1. From the main menu of the Veeam Backup & Replication console, select Manage Credentials.
2. In the Manage Credentials window, select the record with empty Last edited field and click Edit.
3. In the opened Credentials window, click OK (no need to do any modifications).
4. Repeat steps 1 and 2 for all credentials records whose Last edited field is empty.
5. After editing all records, click OK in the Manage Credentials window.

This will update empty Last edited fields and fix the issue. You will be able to add a new AHV cluster.