Help with Roll Up Custom Fields to portfolio

Hi All,

I have these custom fields in my projects.


I am trying to ensure that the ‘Mins Contracted’ number field rolls up to portfolio level but it is not finding it despite it being in the library.

Any suggestions?

We had the bug recently with my team, when creating a rollup field in a portfolio I had to add that field to the portfolio, then create the rollup, then remove the field