Saving project as template

Welcome to the Asana Community Forum @Eugenio_Baroncelli :wave:

Was your complete organization upgrade in Asana or just a workspace or team for example?
Here is an overview on the difference: Asana Help Center and https://help.asana.com/hc/en-us/articles/14108488926619-Upgrade-and-billing

Because in case for example only one team was upgraded and the project you are trying to save as template is in another team that could be one reason why it might not be working.

In your specific case I recommend contacting support as they will be able to look into your account directly to see all the details about your plan and set up.