Having each individual person reach out via a ticket isn't going to help the community at large. This is what helped me:
Click on your profile picture in the upper right corner
Go to Settings
Choose My Teams
Click on Set Default Team text link
In the window that pops up, choose your agency name, and click the set default team button
If this doesn't work, Upwork may have to do something else either on their end, or in your settings first to get this step set up. But doing these steps that I mentioned, and these steps only, always puts my agency in the marketplace for me. But, be warned, your agency will be in the marketplacel, but your freelance account will NOT be. This means new clients will not find your freelancer account. Thus, your freelaner account will not get ANY invites from new clients. Please correct me if I'm wrong, Goran, but I beleive users can have either their freelancer profile or agency in the marketpplace, not both.