Error that we exceeded users but we did not, can't start builds

We are encountering a bug where we can’t start builds. It says we’re over our user count but we are not.

We are unable to start your build at this time. You exceeded the number of users allowed for your plan. Please review your plan details and follow the steps to resolution.

Standard Tier Plan
Up to 5000 unique users
25000 Credits
40000 OSS Credits per month
Linux, Windows, macOS, FreeBSD builds

This isn’t the first time this has happened to us, and this time it looks like we can’t try to get around it with the disabling of users. We shouldn’t have to disable users because we’re nowhere close to 5000, but we also need to get our builds working again.