That means that the seller has some restrictions and now allowing your bids.
If you give me the item number, I could check if I can get more information.
You can also ask the seller about restrictions which are set on his/her listing.
Here is all information which was provided by eBay on this item:
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Unfortunately, the seller cannot accept your bid on this item. This can happen for a couple of reasons. For example, the seller may be limiting how many items you can buy from him or her in a specific time period.
eBay did not specify exact reason for that, but suggested to contact the seller to find out.