Error message when trying to download Vanguard 1099

Please, when trying to download my 1099 from Vanguard (brokerage account), I receive an error message...

ERROR for site owner: Invalid site key

I was able to successfully download from two other financial institutions.

 

Is there anything particular I need to be aware of?  Last year I was successful with all my downloads, including Vanguard.

 

Thank you