I cannot open the global trade hq

They just said: 

Hi Mayor, thanks for reaching out to EA!

I understand that you are wondering about the unavailability of the social features in the game. Need not worry, I will assist you with the proper information.

The reason behind this is that you have set your age to under the minimum age required to access the login feature in the game. However, if you are not underage please let us know so we can help you with the proper instructions to update the age.

For more information on age restrictions within our games then please head on over to the below web address.

https://help.ea.com/en-us/help/mobile/ea-and-age-restrictions-for-mobile-games/

Thanks again for contacting EA help. Please feel free to contact us whenever you need our assistance. We will be happy to assist you.