On a client's ACF 2021 server, we noticed that every day since 6/14 there has been some issue with communication to the license server. They are a few patches behind, that we are going to get taken care of.
In June it will fail, get success a day later, then fail again seconds later.
The license POST request has failed. Status Code: 400 Reason: Bad Request
In late June and early July it moves to: "An error has occurred while sending usage data to server."
And now in late July it fails the same way early June did. A service restart allowed success and we'll be monitoring.
Anyone running into this? It was noticed because it kept throwing the admin a grace period warning.