Hello Harry ,
Welcome to VMware communities!
We can access Skyline Advisor either by entering the MYVMware credentails or through CSP. If you are unable to login using either one of these options please try using incognito mode .
If the problem persists even after trying these steps please update the information using the link VMware Skyline Community - Smartsheet.com
Thanks for the help.
Just to confirm that logging into to Skyline via incognito mode, then logging in via a normal browser session worked.