Update your schools URN in SIMS
In order for IRIS to be able to pull data from your SIMS instance, your schools URN (Unique Reference Number) needs to be up-to-date.
Please ensure your schools latest URN is entered on the Establishment panel as per page 51 of the SIMS help guide. This is accessed via Focus > School > School Details.
You can find your schools URN, as well as other details, on the gov.uk website.