Hi, I just had the same problem. I already have access to the My Business API and am using it. I added another project under my account and was able to enable the API's. But when I tried to use the API's they failed and it turns out I have a "Requests per minute" quota of 0. All the other quotas have values. "Create Location per day" 100, "update location per day" 10,000.
Is this because I just created it? I checked the pre reqs above and completed the form to increase quota so I can use it.
I really need access to the API and am concerned how long it may take and even if it gets actions. I think I have submitted these forms before and nothing happened until I asked a friend I knew at google to help.