SSIS 2016 - Connection Managers Not using Parameters or Environment Vars

Hi,

I have upgraded a 2008R2 SSIS solution to 2016.

I have done the following steps:

1. Converted to Project Deployment Model
2. Converted Connections to Project level connections
3. Created project parameters
4. Parameterized each project connection to use a parameter
5. Deployed project to SSISDB
6. Created Environment variable and parameters
7. Clicked 'Configure' on project (in SSISDB) to assign Environment variables to parameters
8. Clicked 'Execute' on the package (within SSISDB) and selected the Environment to use

However, the package does not run with the environment variables - or with the parameter. It continues to use the package setting.

Any idea what I might have missed?

Thanks!