Why is my Vault tab in Inventor Greyed out?

Question

Why is my Vault tab in Inventor Greyed out?

Answer

The first thing to check is that you are in the correct project, you should ensure that you are using a vaulted project, this will generally remedy the issue. 

For more info, please see this blog post: https://www.cadlinecommunity.co.uk/hc/en-us/articles/204774781