I am experiencing the same issue and have not had any luck. I have removed both the staging and the live URL completely and saved the changes. I then waited hours before adding a new URL, added the new staging and live URLs and saved each. I then entered the license key into Wordpress and it still doesn’t accept it. I have tried this over many days waiting to see if it will magically work, but it hasn’t.
Hey There,
I have split this into your own support ticket for you now to help support you more easily 
Would you mind providing us with login credentials so we can take a closer look? Please provide following information:
Set it as Secure Note
- Link to your site
- WordPress Admin username / password
- FTP credentials
All the best!
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