If you are having trouble signing up for Managed Payments, there are some good troubleshooting tips to be found in this thread:
https://community.ebay.com/t5/Payments/Managed-Payments-Registration-Walkthrough/m-p/31092219#M79735
Common issues involve making sure your eBay account type matches your checking account type (personal account vs. business account), making sure your name is spelled exactly the same on both accounts including any middle name or initial, making sure you are using the correct routing number for your checking account, and using a street address rather than a PO Box.
