Hello again, I thing our problem is in the way the flow is launched. The Flow actually works with the systemuser (Owner) but the only thing that all fields on the form have to be filled in. We find this out yesterday.
We are running the flow from the Ribbon and if the field Available Date doesn't contain data the flow is failed. This field is not business required on the form. But it's required on the trigger in the flow.

So we can't run the flow if some of the data is null which doesn't make any sense.
Just to be sure. We didn't change anything in the flow except we just filled the Available data field and it's succeeded.

Also my colleagues said they experienced the same with their flows when it's manually starting from the Ribbon.
Any ideas why it happening and hove to fix?