Macrium Reflect keeps asking for password?

I've no idea what the password is or when it was setup even! Just tried to create another local user family account, but no joy, I get 'Something went wrong. Try again or tap cancel to setup your device later'. I did a reboot but get the same thing. I wonder if this is why I only have the one user admin account, not being able to create another account?

More info:
I managed to create another local user admin but couldn't give it a name, I could only enter an email address. It opened the account as password protected even though I wasn't given an option to enter one. I didn't want one anyway.

I removed Reflect again, cleaned registry and reinstalled again. Set up a windows system backup, gave it a schedule and it asked for password again!
Why does it ask for this on a free version?

Same here, but when I'm happy with the schedule and click Finish up comes that pesky password screen, every time I try it. Don't you get that then?

No, I don't go in for that stuff, I try to be careful but like I said, I'm the only one ever likely to use this system.

I don't get this bit about when I created a new user account, it just came up with it password protected. Is there any way I can remove it? Presumably MS wouldn't allow that. I can't help thinking this might be the problem although it only started just recently, had no trouble at all before.
Does it matter what build of Reflect I use now? I'm on 1502 but i did try 1495. Are they both 'patched' for the anniversary?

Have you tried activating the built in admin account?

In cmd (with admin rights): net user Administrator /active:yes

To deactivate it again: net user Administrator /active:no

Maybe the password prompt somehow refers to the built in (but normally hidden) admin account.