The sender included an insufficient transaction fee. (Only 25 satoshis per byte, or 6 satoshis per Block Weight Unit)

This transaction is likely to take a VERY long time to confirm (perhaps weeks or months).

It is possible for the sender to create a competing transaction that would make this transaction invalid if the competing transaction confirms.  Therefore, unless you trust the sender to resend the funds if/when this transaction becomes invalid, you should NOT trust that you will actually receive these funds.  You should complain to the sender that they should learn how to use bitcoin properly, and refuse to engage in any additional transactions with them until they've learned to do so properly.  You should also let as many people as possible know not to trust this service since they don't know how to properly create bitcoin transactions.