The issue mostly because the protocol is changed from http to https. Did deactivating and reactivating it fixed the issue? If the issue persists, could you please open a new ticket and provide temporary admin credentials to your site? You can open a new ticket here: https://support.advancedcustomfields.com/new-ticket. Also, please don’t forget to explain the issue again and provide the link to this thread.
Please make sure that you have your license activated correctly for your current site. You can check it out by logging in at https://www.advancedcustomfields.com/my-account/ and check the listed site.
I hope this helps 🙂
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