Amazon Connect creating Forecast

Seeing "Schedule" does not mean it did not generate a computed forecast. What is it showing in the "Last computed" column, if compute failed, then you will not see anything there.

When using data already in the system, you still need to meet the requirements to have enough data. If it does not, prior to schedule, it should show the error message and let you download the error. But sometimes the next scheduled compute overwrites it and you lose the chance to get it. You can open a support case to get reason. But do check your data to see if it has enough, by clicking on LONG TERM's Contact Volume to inspect. After entering Contact Volume for LONG term, click on the "Actual" checkbox on the right, change the range of date to display to last 6-8 month (via CUSTOM), and change the view to "Monthly". The minimum amount of Contacts per month is 2000, this is a combine total of all the queues you have chosen. If you look at the table below, it should show per month with past actual, if each month is <2000 or you have <6 months (12 months preferred) of data that has >2000 contacts. This will fail.

If you only started using Connect for couple months and have >2000 contacts per month, you can import generated data to supplement the missing months so it can generate a forecast. Just follow the pattern that you have to give it the best estimate.

https://docs.aws.amazon.com/connect/latest/adminguide/data-requirements-for-forecasting.html

here some examples on what it look like, one is good and one is bad