SL2 video course not playing on safari

Hi,

We have a video course developed using SL2 Update 13 (html 5 output). When uploaded in HealthStream (our LMS), it plays well in all browsers (iPhone too). But, when uploaded in our server (web version), it doesn't play on Desktop Safari or iPhone using Safari. However, plays well in Android devices. Any help is highly appreciated. Thank you! 

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