Hi @Roffe85,
welcome to the Homey Community Forum.
Just searched quick for other Nimly topics, but didn’t found much. So I guess there are not many users using Nimly locks which are able to help you.
And I don’t think any other user can help or point in the right direction if they don’t have a Nimly lock themselves.
Perhaps it would be helpful for other users to post your flows and provide further information, e.g. whether the PIN is only saved via a flow or which general settings can be made.
Or contact the developer of the app. In most cases, contact options can be found in the app store at the bottom of the webpage.