Be more specific with error messages.
I tried numerous times to pay, always receiving a generic error message that did not indicate what the error was (see attached screenshot). It was only after two days and numerous attempts that I tried scheduling the payment for the next day, and that worked. Apparently, scheduling it for the same day causes errors, but there was no way to know that from the generic error message. If the error message had said that I couldn't schedule for the same day, then it would have saved a lot of time and headache!
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Shuli Elisheva commented
I tried numerous times to pay, always receiving a generic error message that did not indicate what the error was (see attached screenshot). It was only after two days and numerous attempts that I tried scheduling the payment for the next day, and that worked. Apparently, scheduling it for the same day causes errors, but there was no way to know that from the generic error message. If the error message had said that I couldn't schedule for the same day, then it would have saved a lot of time and headache!