I arrived the stadium on time but was not allowed to come in to manage my team AGAIN.

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I am not surprised at all because I encountered this for about 10 times. I have not been allowed to attend all matches which are started at about 11:30 a.m. GMT+8.

In future, in case I have no time to attend my match for whole day. I will change my home match time in order to use this feature to prevent opponent managers attending match.