afaik there are at least 2 conditions for a transfer (at least these were set in the past)
1. target and source account have to be payed
2. the same slot as used by the char on the source account has to be free on the target account (slot numbers start with 0 from the top)
so check number 2 to be sure that a move is possible - if you're lucky they changed rule 1 in the meantime
edit: but I suppose they all use slot 0 - at least most people create their chars from top to bottom
1. target and source account have to be payed
2. the same slot as used by the char on the source account has to be free on the target account (slot numbers start with 0 from the top)
so check number 2 to be sure that a move is possible - if you're lucky they changed rule 1 in the meantime
edit: but I suppose they all use slot 0 - at least most people create their chars from top to bottom
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