Hi Ramulkn,
I applied CRM 2016 Online Trail, and I connected it with PowerApps. when I trigger a flow by “when a record is created in CRM”, I was able to select the Organization Name. Below is a screenshot:

Please provide information about:
1.Can you sign in your CRM 2016 Online Trail and check your contact details as below?

2.Were you able to do any operations on your CRM 2016 Online Trail? For example, crate Leads, Opportunities, etc.
3.When you connected CRM to PowerApps, did you sign in with correct Email and Password?
Best regards,
Mabel Mao