Hello,

The accepted option does not work, but the refused option does.

If you try to accept, this is what it displays below.

Couldn't it have something to do with the fact that it costs 10 stars and you only have 5?

I didn't know that.

Kirikou: Ça je ne savais pas.

No, the number of stars should never be a reason, as you are the recipient of the request and not the initiator.
If your opponent is a VIP, he can submit a request to change the time of your match. As an opponent, you should be perfectly capable of accepting or refusing this proposal free of charge, without having to be a VIP or spend stars.
By the way, as a reminder (at least that's how it worked when I often used the option): when a manager makes a request for a change of schedule, if you don't react (refusal) within 24 hours, his request is automatically accepted by the system.
So it's definitely a bug.

Sorry, I misread that! It said accept, so much for me. So I don't know.

You can send your request even if you're not a VIP.

If the initiator of the request is not a VIP and has no credit, it will still be sent and when you try to reply, it will display this error.