Thanks for the reply. Seems something i would try but using two separate flows seems kind of bad idea tho we have a flow that should do all the work.
I got it to work, all my tests seem creating only one event but it triggers sometimes twice tho.
@lardo5150 sorry that i tagged you but you seemed most active Microsoft employee.
So until Microsoft fixes their trigger i made a workaround myself
1. When triggered "when an event is added, updated or modified" (outlook app) and action is "added"
2. Get event createdDateTime from added outlook event
3. Get all items from sharepoint calendar but list only 2 newest items
4. Extract only custom field "test id" from sharepoint "get all items" action
5. Take the first entry from extracted data
6. Compare action nr5 with action nr2
7. If it is the same (event already exists) then dont trigger the flow
It was annoying to make extra 6 steps to get this one simple flow to work so it wouldnt create duplicate events into my sharepoint calendar.