Youtube API v3 shows "Access Not Configured"

I got frustrated and created a new project with a new key and it worked like a charm.

This solved for me.... i first followed @Ninj answer...still no change. Then, After adding my domain urls to 'allowed referers' list, i regenerated the key alone it then worked like a charm !

i guess google parses allowed urls from the key string itself, not from updated settings

Additionnaly when I opened the requested URL in browser I found that the API call returned

{"domain": "usageLimits"}

I tried the above solutions without success.

Creating a new project from scratch solved the issue

Thanks @Danra, you helped, but I add this answer because your comment is default hidden.

Oooook...

Do all you have to with the API activations before you generate any keys!

Unactivating or reactivating API (like "Youtube Data") silently destroys your key validity. At least for the server one.

So the solution is, when you get the same error as me:

• destroy your server key (delete it completely, do not only regenerate)
• deactivate then reactivate all APIs you need
• create a new server key
• thank Google for the so clear error messages (optional)