What do you mean "can't open" - Nothing happens - Password screen is there but wont take password - Password screen is there but my password doesn't work - ....
MORE WORDS, please

I used the same password for 2017 with success but doesn't work on 2016.

Instead, I receive an error message that I am not authenticated.  It prompts me

to have a code sent to my phone to provide my identity but after entering code, it

still denies me access.  It says to try later but same results next day.

 

try resetting the password
Next - Call support (UGH), but they are closed 24-25th.

Didn't work.....will call tech support