I had the same problem when installing Wordpress 5.0.1. In my case, it was connected with a formidable premium. The formidable support team also sent a message because something has changed there, here is their message:
Hi , As some of you may know, we updated the licensing software on our site a few months ago. This meant we had to move all of the licensing information to a new format. Unfortunately, this caused some of the custom site limits to be reduced for add-ons that werent bundled with a grandfathered license. We had a few people understandably ask us about this. Our solution was that they could manually upgrade to a bundle, which would solve the problem. However, over the last month we were made aware that some people were upset with the reduction in limits, but hadnt contacted us about it. As a result, we set to work and moved everyone with a Business or Enterprise license over to a bundle that would automatically correct the issue. I want to take this opportunity to apologize for the trouble we may have caused, and that we didnt realize sooner that so many people had been negatively affected. I would also like to reassure you that we never intend to remove a grandfathered benefit from your account. I hope you were not among the group that lost faith in us over this issue. While we will always aim to resolve issues as soon as they occur, we would ask that if you ever run into another problem, that you contact us about it first. That way, we can rectify the problem and reduce the trouble it causes you.
So this can be very common if the plugin changes the way the developer API is accessed.
Best regards, Norbert
Norbert
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