I have updated the original post with the configuration commands I executed.
My device model (https://www.amazon.com/gp/product/B07CKNWGN4/) is not listed on the official list of compatible devices (Switches, Dimmers and Relays)
The driver used - Hubitat/tasmota-tuyamcu-wifi-dimmer-expanded.groovy at release · markus-li/Hubitat · GitHub
Re password.. I set the password in the device web interface first, test the Tasmota web page now required login with admin/. Than in HE device config page I added the same password in Preferences>Device Password field and clicked "Save Preferences". Is that not a right procedure?
