Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
I have the same issue,
When we trying to open volume center(VLSC)- ( https://www.microsoft.com/Licensing/servicecenter/MSALoginError.aspx )
Tryin to click on the sign in and is coming back to the same page !!
We are unable to complete your action
Error Code E06
You have linked your VLSC sign in account with your work account "******@*****.onmicrosoft.com". Please use your work account to Sign In