I am not using a browser but the Quickbooks Online desktop application.  I was able to schedule payment for two vendors, but trying for 3 others and keep getting that error.  It appears that it is checking some field which it does not like (e.g., Date Due field or the Bill Date).  I have tried the "help' and was with the customer service person for an hour and they were not able to figure out the issue (and unfortunately we got disconnected).  The customer service from couple days ago, gave me a 800 number and it was for bill.com.  The person on the call said that he is getting a lot of these calls but bill.com does not service Quickbooks Online anymore.

I am a new user of Quickbooks Online (just two days ago migrated from Desktop).  I feel like Desktop was much more stable than the Online version.  Please let me know if you have any other suggestions.  Thanks.