I completed the call of Dragons th12 task but did not receive credits (ayet studios)

I have completed and received credits for the previous steps but not this one of the city at level 13. Before this task there is to shop for a gem supply but I haven't considered it. Do I have to buy that gem supply to move forward?

submitted by /u/shido543
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source https://www.reddit.com/r/beermoney/comments/1bfkv0q/i_completed_the_call_of_dragons_th12_task_but_did/