Did you delete the photos or just forgot your password to the vault? Also is this on an android phone?
If it is the former.. Then there are quite a few programs on the net that can help you 'attempt' to recover deleted images and data. Most of them, however, are only free to try, but 'may' charge a fee to actually restore the missing data.
If it is the latter, that is password help, which we cannot do here, as it is against forum policy. Please read...
http/www.tomsguide.com/forum/id-2311806/read-passwords-lock-codes-pin-numbers.html
You can, however obtain the help you need on the Private Photo Vault website. There is info there on how to resolve that problem. https
/privatephotovault.com/faq/