Assuming that you have the Remember MainWP Main API Key box checked, please try deleting API Activation data.
Go to MainWP Dashboard > Settings > Tools and click the Delete extensions API Activation data button.
Then reactivate your Extensions Main API key.
If the issue persists, please try reinstalling the extensions. Go to WordPress Dashboard > Plugins page, deactivate and delete all MainWP extensions, and then Install them on MainWP Dashboard > Extensions page.
If that doesn’t help either, please open a private Help Desk ticket so we can collect some additional information & investigate further.