Google is always Disproving my Ads

Hi Everyone I am stuck. One of my Client is running a travel agency. He provides services like Visa Air ticket tour packages and more. I have created text ads and as well as Call ads in google ads. When i am using words like Visa, Tour, Package Travel to Europe and More my ads are getting disapproved always. It shows me that a govement certificate is required and your domain must be linked with the govement domain.
Some one help me with.

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