Hmm. As Glorfindel commented, Community user is only filtered on reputation tab and Metas don't have reputation tab. However there are two work-around:
You can always click on Meta User from the profile of Community user on main site:
You can force the reputation tab on Meta Stack Overflow i.e meta.stackoverflow.com/users?tab=reputation and then try ...
To list all stack exchange sites for you, the current logged in user:
To list all stack exchange sites for a user id:
... where 3858478 is the user's id.
This will show your latest 50 actions on all sites (not just comments.)