If you go to https://docs.aws.amazon.com/general/latest/gr/rekognition.html#limits_rekognition, there is a corresponding quota:
Maximum number of concurrently running Amazon Rekognition Custom Labels models per account : 2
BTW, this page gives you all quotas around Rekognition: please, have a detailled look at it.
You can ask AWS Support for quota increase via the console of your account. It's documented here: https://docs.aws.amazon.com/servicequotas/latest/userguide/request-quota-increase.html
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