Thanks for reporting this. This is not something you’ve done wrong.
Objo Studio has a saved licence activation on your Mac, but the licensing service no longer recognises the activation ID associated with it. Studio is handling that situation badly: it still appears activated locally, while Build asks you to activate again and that second activation then encounters the activation limit.
Before changing anything, could you please open Settings → License, click Export Diagnostics, and attach the resulting text file here? The report is designed not to include your licence key, customer email, project names, source code, machine name, or username. If you feel more comfortable emailing it then please do that (contact@objo.dev)
Please also send me the email address used to purchase the licence privately - do not post your licence key publicly. I can inspect and reset the stale activation from this end. Once I confirm that has been done, you should be able to click Deactivate in Studio, activate the licence again, and use Check Now successfully.
I’ll also treat the confusing error and missing recovery path as an Objo Studio bug and will investigate / fix it.