Pre-populated email with 2+ addresses (CC or BCC)?

Hi all,

I am following the instructions here: Add a mailto link in an email and all works well except the CC/BCC options, despite being shown in that documentation. I use the following code (with real addresses) and receive "Please enter a valid email address (e.g., [email protected])":

[email protected][email protected]

I have also tried a comma and space between the two, %20 between them, even ,%20 between them with no luck. The only way to avoid the error is to have one email address. ?=body and ?=subject work fine.

Is it not possible to have multiple recipients in a pre-populated email? Thanks!