2 different dates of different table

I am using created_at date from this and count of these ids so, for selected data I must have 4 counts which works fine when I select 3/11/2024 date. 
(Note: In this table my data increase with the current date, so there's no future date data like data for tommorrow on for this week etc )
But, with this I have to show meeting count from task table and I am using this start date from task table, in my powerbi report I have synced these both date filters;

as you can see against user id 1, I have this data but the start date is different, Now when I select any future date, it in result gives me 0 for meeting count.

And, when I create calendar table, I am unable to active relation between bith these tables in 1 time.