You may be seeing this message on your listing for a couple reasons.
1) Have you just recently verified your listing? Note that it may take up to 2 weeks from the time you've verified that listing to appear on Google Maps, and during that time your Active listing will say “We currently do not support this location” on it. Please just sit tight.
2) Has your listing been verified and live for some time? Search for it on maps.google.com ("business name, city/phone"). Sometimes the links from your Places dashboard aren't synced properly, so you should always search on Maps first to make sure it is indeed removed . Often it's still live and there, you just need to look it up via maps.google.com.
3) If you’ve done a search on maps.google.com and still don't see it, go to your Places dashboard (google.com/places) and “poke” the listing by clicking Edit > Submit. Give it a couple days, and then again, go to maps.google.com to see if you see it appear live.
4) If none of that helps, then your listing has been removed from Google Maps. If you believe your listing should not have been removed, get in touch with our support team:
Select: My listing no longer appears on Google Maps or is incorrectly marked as closed. > Fill out the short form, hit Submit, and await an e-mail from a member of our support team (it may take a few days).
Edited June 14 to reflect troubleshooter updates. - Jade
Update -- We're currently experiencing an issue displaying some pages, affecting service area businesses in particular. My recommendation is that you make absolutely certain that you follow the quality guidelines, and then work through #4 above. You'll get an email back from the support team that asks you to wait if we think your listing is affected.