Crack in mortar where extension joins house

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Please see attched photos of one side of the extension. The other side is exactly the same.
The extension was built 3 years ago and has been fine up until now.
I would appreciate any thoughts on potential cause, and what are the next steps.
 

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It's normal. The joint should be of flexible mastic to deal with such movement, not mortar.
 
Thank you for replying. What is the best way to rectify this, as there is no mortar holding the bricks together. I put a regular knife in to one of the cracks and it goes all the way in, to the depth of a brick. Also water can get in, which is a concern.
 
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