Why can't I use Yahoo, AOL or iCloud addresses in the Coaches Console?

It is not that you are not allowed to use them; you are free to use whatever address you want for your Console communications with your clients.

A Yahoo, AOL or iCloud address is just not a particularly good choice for email delivery via a 3rd party system (the Coaches Console in this case).

If you send from the Console messages to people who also have a Yahoo/AOL/iCloud address (from your Yahoo address to their Yahoo/AOL/iCloud address via the Console), their Yahoo/AOL/iCloud address will automatically bounce your emails (not accept them).

That is because Yahoo (also iCloud and AOL) have a stricter email sender policy where, if you send emails not from your Yahoo/AOL/iCloud address inbox directly, but via a 3rd party system (the Console in this case), they will not accept them under suspicion of potential spoofing (as in someone else may try to impersonate you in another system). So, Yahoo/AOL/iCloud do this with the good intention to protect their email clients from potential spoofing.

The Coaches Console cannot do anything in this regard (cannot force Yahoo/AOL/iCloud addresses to accept your emails). That is why we advise you to use a different address. A better choice in terms of free email addresses would be Gmail. But the better solution would be to have a custom domain address (e.g.: [e-mail]) where you could authorize the Console email server to send emails in your name. Instructions in this FAQ:

How can I authorize the Coaches Console email server to send in the name of my custom email address?