Didn´t you previously post that you sent $700 to yourself that is still waiting for you to pick up (but can´t at the moment because the agencies that can dispense that much at one time are closed )?
The first time you sent funds to yourself you should have received a confirmation email asking the recipient to provide additional information (complete and submit a form online).
If you have not done so, that may be the reason your transfers are now being blocked.
As I previousl,y posted, I made an error when I submited the form and my transfers were blocked until I submitted a corrected form (declaration).
Perhaps WU has a rule which prohibits making or receiving additional transfers to yourself while you already have one in the pipleline, but that semms less likely to be the reason than not having completed the required declaration.