I accept that my question is really stupid. I've been using Last Pass for well over 10 yr on multiple devices and never had any problem. I changed my Master Password on my PC as I periodically do. When I then tried to log on to my phone Last Pass would not accept. I use complex passwords and checked the phone password entry many, many times. So many that I was even locked out of Last Pass for a short time (as I would expect). Everything obvious has been checked and rechecked. Thought I would ask if anyone has any ideas. Thank you.