Improve the Azure sign-in process
Sign-in (portal.azure.com or Storage explorer or any other place where Microsoft credentials are required) is cumbersome.
What I mean is this - if you are not allowed to be signed it all the time (remembered via browser cookies) due to security considerations and you have several accounts, all of which are connected to 10+ AAD tenants, and at least half require two-factor sign-in, login times take forever. If I log into certain apps which try to list all my tenants before I am even able to tell the application which explicit ones I want to connect to (like Storage Explorer) will ask me to re-enter my password "n" times for each next tenant, also asking me to approve MFA on my phone for each one.
So - maybe add a dialog for the account you are trying to sign in with (including on regular web login to portal.azure.com or portal.office.com or my.visualstudio.com - you get the meaning), to detect and display which subscription(s) or tenant(s) you would like to see when logging in with this Azure AD account, and then ask you for passwords and MFA tokens or approvals. Once logged in, have the option to select to "activate" another(other) tenant(s) or subscription(s) that is(are) linked to the account, after which, it will ask you to log in there.
You can see what I mean if you create an account with 10+ MFA-protected tenants and connect for example via Storage Explorer. Once, it took me 2.5 minutes just to sign in :)