These are the most common reasons you might not be able to place a bid, and how to resolve them:
Tophatter is a fast-moving live environment and many bids are placed simultaneously. This may result in a competing bid to yours being recognized. To resolve this, try placing another bid. Be sure to tap a second time to confirm your bid, if required.
There is a limited number of unpaid orders a buyer can have before they must pay before bidding again. To resolve this, be sure to pay for all orders right away.
A seller may block a buyer who has purchased from them. To resolve this, try using our Search tool to find similar items from different sellers.
Bidding is disabled temporarily when buyers have too many canceled transactions. Read more in the FAQ: What if I have too many cancelled orders?If you're unable to bid for this reason, you can still participate by shopping for items with the Buy Now option.
The issue could be technical. Try closing any apps running in the background and restart your device and the app, or restart the web browser that you are using and clear your browser cache.
If none of the above apply and you're still having trouble bidding, please Contact support and provide the error code you are receiving.