New Free Acc User login fails

I started using Free Version about 3 days ago with succesful free activation.
Today I am blocked from using App and advised “due to violation I must contact sales”. It worked perfect for 3 days. Former Avtivation Key does is not accepted anymore.

Would the fact that I modified Contacts Labels cause this issue? If this is the only possible issue can I reset the default Contacts Labels, and then will the former Key reactivate my account?

Please advise how to get going again.

Free licenses are for personal home use only. You can’t use them with your business, education or other organisation email accounts. For that you will need to purchase a Pro license.