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Did it mention any particular location where you have to give biometrics?
no you can go to your nearest location or which ever you think is good for you. you might have to take appointment before you go, can do this online.
 
Hi,
I applied and got my AOR on 17th April. I've yet to receive biometric letter. Should i be concerned?
its too long time it a month now for you , max you should get in week
its really something to worry about