Error modifying offline ignore period

I’m only trying to modify my offline ignore period, but then it shows “You have reached the max number of Datastreams you can create”. Where’s the problem?.
I am using 35 datastreams without any problem (I am a free user, but I comes from blynk legacy and I get some promo, not remember exactly)
I tried deleting one of currents datastreams, but i got the same problem.

Thanks in advance.

Hi Antonio,

The datastream limit on the free plan is 30. You need to delete 5 datastreams and you will be able to save changes to the template. Or switch to another plan on the PLUS plan the limit is 80, on the PRO plan the limit is 255.
You can find more information about limits at the link - Limits - Blynk Documentation