I am having the same problem to activate the venv with the command
source /www/wwwroot/myapp/e91dc8efa4a4f7a9839ba97535567859_venv/bin/activate
The problem is that at /www/wwwroot/myapp/e91dc8efa4a4f7a9839ba97535567859_venv/bin/ (or equivalent directory) there is not a file called activate as it is expected.
Did you found any solution?